Question About Migrating to Office 365

After a cutover migration from Exchange 2010 to Office 365, what is involved in cancelling the migration and rolling back to the on-premises Exchange 2010?

Ed is correct, however if you have not already migrated to O365 you might want to test a single mailbox migrating and rolling back as;
I ran across this post the other day
https://social.technet.microsoft.com/Forums/exchange/en-US/20c46273-e95d-4836-b2a7-903f649282a6/mailbox-default-settings-restore-possible-?forum=exchange2010
Of course this could just be a strange anomaly that you will not experience, however its definitely something to watch/tests and of course monitor the link above to see if a resolution is found.
If you experience the same thing you may want to open a case with MS to resolve
Search, Recover, & Extract Mailboxes, Folders, & Email Items from Offline Exchange Mailbox and Public Folder EDB's and Live Exchange Servers or Import/Migrate direct from Offline EDB to Any Production Exchange Server, even cross version i.e. 2003 -->
2007 --> 2010 --> 2013 with Lucid8's
DigiScope

Similar Messages

Migrating to Office 365, keeping Lync Server 2010 on Premise

Hi,
I have a Lync Server 2010 on Premises implemented, it is use a UM Sever to connect with Exchange Server 2010.
I migrate to Office 365 Exchange Online and keep all the Lync Server On Premise current functionalities, including "Conversations history", total connection between Lync Server and mailboxes (on O365) for conference calls and Web conferences?
Thank you,
Nerio

Hi,
If you want to integration Lync 2010 integration with Exchange online, you must configure Edge server in your on-premises Lync Server 2010 deployment by completing the following tasks:
Configure a shared SIP address space
Configure a hosting provider on the Edge Server
Create a DNS Record for Integration with Hosted Exchange
Verify replication of the updated Central Management store
More details:
http://technet.microsoft.com/en-us/library/hh533880.aspx
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

Downsize Public Folders for Migration to Office 365

To migrate public folders, I have been following this link: http://technet.microsoft.com/en-us/library/jj983799%28v=exchg.150%29.aspx
However, this customer's public folders are exceeding well over 50GB. There are contacts and a calendar. I am looking for assistance/advice on downsizing public folders for migrating to Office 365.
Exchange 2007
Server: Windows Server 2008 Standard

Hi,
To reduce the public folder's size prior to the migration, you can try to delete the old content or split it into multiple smaller public folders.
Here is a related article for your reference.
Public Folders and Exchange Online
http://blogs.technet.com/b/exchange/archive/2013/05/02/public-folders-and-exchange-online.aspx
Best regards,
Belinda
Belinda Ma
TechNet Community Support

Public Folder Migration to Office 365

I am performing a Public Folder Migration to Office 365 according to the steps at http://technet.microsoft.com/en-us/library/jj983799(v=exchg.150).aspx#Scripts. I made it down to Step 5, substep 5 where we are supposed to start the migration with a
New-PublicFolderMigrationRequest. The script fails with the following error message:
Starting a command on remote server failed with the following error message : [ClientAccessServer=BN1PR07CA0067,BackEndServer=co1pr07mb395.namprd07.prod.outlook.com,RequestId
=0f9fb78e-1c50-4371-9add-414cbbfc9f69,TimeStamp=10/30/2014 3:24:26 PM] [FailureCategory=Cafe-HttpProxyException] Cannot replay request as bufferedRegionStream cannot be reset
. For more information, see the about_Remote_Troubleshooting Help topic.
+ CategoryInfo : OperationStopped: (System.Manageme...pressionSyncJob:PSInvokeExpressionSyncJob) [], PSRemotingTransportException
+ FullyQualifiedErrorId : JobFailure
Any help or guidance is very much appreciated.
Randy Goodson

So...I double-checked the authentication setting on Outlook Anywhere...it says Basic. But, when I changed to NTLM in the command line, it seems like it is working. However, now I get the following error:
The specified mailbox "Mailbox1" doesn't exist.
+ CategoryInfo : NotSpecified: (:) [New-PublicFolderMigrationRequest], ManagementObjectNotFoundException
+ FullyQualifiedErrorId : [Server=CO1PR07MB395,RequestId=e9e9e242-9b1c-46ad-8f0f-375eeb0d5527,TimeStamp=10/31/2014 1:47:31 PM] [FailureCategory=Cmdlet-ManagementObjectNo
tFoundException] 933A0896,Microsoft.Exchange.Management.RecipientTasks.NewPublicFolderMigrationRequest
Any assistance would be greatly appreciated.
Thanks,
Randy
Randy Goodson

Disabling AD Autodiscover while migrating to Office 365

I'm in the middle of migrating from Exchange 2007 to Office 365. I can autodiscover to the Office 365 service successfully in every instance except when I'm on a PC joined to the AD domain and the domain is accessible. I have added a registry
key on my test PC that keeps it from using the AD SCP to autodiscover but it still gets my Exchange server mailbox instead of the Office 365 mailbox even without using SCP.
If I remove the PC from the domain, it works both locally and remotely so I know all my other settings are okay, it's only giving me this issue when it's a domain member and is running local to the AD domain. Tried a laptop, joined it to the domain,
took it home and let it autoconfigure, worked great. Same laptop, when local to the domain, tries to autoconfigure using the local Exchange server settings.
I'd like to give my users back their Outlook (rather than OWA) after I migrate them. How do I prevent my locally deployed, AD-joined computers from getting autodiscover info from my local Exchange CAS server while I complete my migration to Office
365?

Hi,
I ran into the same problem. I came up with a work around but I’m not sure this is the correct approach.
First, with Outlook 2010 already installed I had to run the Set up and configure your Office desktop apps from Office 365. I’m not sure of all the configuration changes this makes but I know after you install it that it will allow
you to change the username field when trying to authenticate to Office 365 (will get back to that in a minute)
Second, from my domain joined computer where outlook was connected to my on premise exchange 2007 server mailbox, I setup a new outlook account, either from the control panel mail icon, or from within outlook (both worked) Note; doing from within your already
existing configured outlook allowed me to migrate my email from on-premise to office 365.
From Control Panel/Mail , I created profile name “Office 365”
In the next window it then auto discovered my on premise exchange mailbox email address
[email protected] (which in my case is the same as the office 365 email address
[email protected] )
I replaced the email address with the secondary domain email address that Microsoft office 365 created
[email protected]. I did not put in password at this point and clicked next. It then searched for mailbox, a windows security mail application windows will pop up.
This is where I then replace username
[email protected] with
[email protected] and put in my office 365 account password.
As mentioned above when I said I would get back to that in a minute, if you don’t run the
Set up and configure your Office desktop apps from Office 365. You will not have the option to replace the username from the windows security mail application windows.
It finishes configuration and you’re now connected.
Worth mentioning though that I’m still having some funky mail delivery issues with on-premise users with my imported “contacts” in outlook. The contacts work from office 365 web apps, but not from outlook. If I type the address everything
is fine, but using contacts or replying to on-premise users is giving me some grief. It’s a contact issue but I’m still unable to resolve it.

Pre-Requirement for Stage Migration in Office 365

Hi,
Please help to find the prerequisites or Hardware and software requirement for performing an Stage Migration on office 365.
Regards,
Shabu.B

Hi,
This forum is to discuss problems of Office development such as VBA, VSTO, Apps for Office .etc.
Since your issue is more related to the feature of Office 365, as @AK-Azure said, I suggest you posting in
OFFICE 365 FORUMS for more effective responses.
Thanks for your understanding.
We are trying to better understand customer views on social support experience, so your participation in this interview project would be greatly appreciated if you have time. Thanks for helping make community forums a great place.
Click
HERE to participate the survey.

SBS 2008 PREMIUM - Migration to Office 365 (E3)

Hi,
I have two customers running 'Windows Server SBS 2008 Premium' and wondering to migrate their environment to 'Office 365', since this is an old version of Windows cannot run the AD FS tool (as my previous post
https://social.technet.microsoft.com/Forums/exchange/en-US/4b5d7942-f9a6-4138-9ba8-596a35e36754/sbs-2008-microsoft-azure-active-directory-module-for-windows-powershell-is-not-supported-by-your?forum=WindowsAzureAD) they will create a new environment with
Windows Server 2012 R2.
Looking at 'https://www.skykick.com/products/small-business-migrations' isn't clear about Active Directory
migration or sync.
Can someone share thoughts and review if my plan is correct to use this tool?
- install a new server and AD domain;
- install SSL and AD FS tool in a way to integrate it with Office 365 Servers
- migrate computers from old DOMAIN (SBS 2008) to the new one (W2k12)
- use this tool to migrate contents from old infrastructure
Any help is appreciated.
tks,
Renato P

Hi ,
Thank you for posting your issue in the forum.
I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.
Best Regards,
Andy Qi
Andy Qi
TechNet Community Support

Summary Report after migrating to Office 365

Hi all,
I just successfully performed a cutover migration off a SBS 2011 Server.
Admins are missing the Daily/Weekly Status report email generated by SBS. The report still goes to the on-premises mailbox. I also unticked the users from the list and created new emails as "external" recipients but did not work.
The DNS is authoritative for contoso.local. I don't know how to create a MX record for contoso.com within that zone.
I think it may be an attribute in AD that needs to be changed.
Could you guys provide help with this?
Regards,
Frank

Hi Frank,
On current situation, please refer to following thread and check if can help you.
Change
email address of SBSMonAcct on SBS 2011
Meanwhile, please refer to the “Completion of the Migration”
section in following article.
Step-By-Step:
Migrating from Exchange 2007 to Office 365
If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu

Migrating from office 365 to OSX Server 2.2.1 Mail server.

hi folks,
I am considering setting up an OSX Server v 2.21 and using it as my main mail server at home, and migrating away from office 365, and using the OSX mail server as my main server. I have my own domain name, and i would be the only user of the mail server.
I would be running this on a mac mini i7 with 16 GB ram.
what anti virus / spam applications are there available for the mac mail server?
thanks.

The power in your computer is fine. I was just trying to warn you that if any network requests come in the server configuration immediately priorises that higher than interacting with the user sitting that the keyboard. Apps you are using may stutter until the network request has been answered. Of course, if you don't have many network users and with a computer that powerful, it probably won't take the server long enough to answer the network request that you notice any problem.
No webmail portal for mail, and no easy way to add one. Just mail apps using POP, SMTP, etc..
Here's the manual for OS X Server if you're interested:
https://help.apple.com/advancedserveradmin/mac/10.8/

Removing Exchange 2007 from SBS 2008 after Migrating to Office 365 Mid Sized with DirSync and SSO

We have recently completed off a Migration of Exchange 2007 to Office 365 Mid Sized platform.
I now need to decomission the old SBS 2008 server as they have moved to a Windows Server 2012 R2 server setup for DC, File and print and application servers.
I need to know what are the ramifications of removing the Exchange 2007 server from the SBS 2008 server and will this remove the LegacyDN details from AD and cause any issues with internal emails between users using Outlook linked through to Office365.
I understand that after removing Exchange 2007 there will be no friendly GUI to update and maintain proxyAddress, targetAddress and LegacyDN addresses, I am comfortable doing this in ADSI edit or with a script.
Will this remove the x500 addresses relating to the on premise Exchange Orgainisation and just leave behind the x500 addresses for Exchange Labs which I assume is the x500 addresses for the Azure AD intergration for Office365.

Hi ,
Thank you for posting your issue in the forum.
I am trying to involve someone familiar with this topic to further look at this issue. There might be some time delay. Appreciate your patience.
Thank you for your understanding and support.
Best Regards,
Andy Qi
Andy Qi
TechNet Community Support

Migrating to office 365/Win 8.1 from Office 2010/Win 7.0 the Outlook Personal folders are missing.

In Office 2010 I had emails archived into private data file personal folders/subfolders under Outlook 2010. My Office 2010 installation was wiped out when I upgraded from Windows 7 to Windows 8.1. The outlook.pst files are still available. When I installed
Office 365 on my Windows 8.1 system, Outlook 365 picked up the .pst and populated the Inbox and Sent folders, but the archived email personal folders are not present, and also the contacts folder is empty. I haven't been able to figure out where on the hard
drive the personal folders were actually archived (in Office 2010 ) or if Office 365 will even support showing these personal folders.

Problem solved. I found a separate .pst file in my backups that contained the personal folders and the contacts. This file wasn't in the Win 8.1 documents\outlook files folder. So two .pst files are needed; one for the emails and the other for the personal
folders.

Decommission Exchange Server 2003 after migration to Office 365

Hello,
We recently made the switch from our Exchange 2003 server to Office 365 with a Directory Sync Server.
Right now both the server is acting as a domain controller and the legacy exchange server. What I would like to do is keep the server as a domain controller and decommission the exchange services.
What do I need to do in order to properly decommission the exchange services without any loss of data/functionality with the directory sync server?
I previously posted this thread http://community.office365.com/en-us/forums/148/p/231357/719776.aspx#719776 but was redirected here.

Directory sync is done through your domain controller, not your Exchange server. True, your server serves both roles, but the Exchange services are not required for DirSync. What I would do, though, if I were you, would be to create a temporary
domain controller in your organization and point your DirSync to it. If that doesn't work, you know there is something on your current system that is required for the DirSync and there is possibly some reliance on Exchange. I'd then remove Exchange
from your server (I'd be sorely tempted to rebuild the server, using the same name and IP as before, just to be sure I started with a clean slate) and re-home the DirSync to it.
Good luck ... HTH.

Several questions about migrating from iPhoto to Aperture

I'm currently a heavy iPhoto user and am looking into migrating to Aperture. Can anyone give me a sense of what I to expect if/when I make this switch?
Here are several particular things I'm wondering about:
1. iPhoto works great as a computerized photo album for casual browsing. (I can see a page of different events with mouse-over previews, plus I can hide poorer shots so that I can just view the highlights.) Will Aperture be a step back in this department? If so, is it possible to "share" my Aperture photos with iPhoto without keeping two parallel copies of everything?
2. When I import an edited photo from iPhoto to Aperture, will the iPhoto "original" become the Aperture "original" and the iPhoto "modified" become the Aperture "modified? Is the same true if I export an edited photo from Aperture to iPhoto?
3. Does Aperture have an analog for "hidden" photos? I currently mark my best shot from a series by hiding the rest. Will I lose this marking if I migrate to Aperture or is there a way to preserve it?
4. I currently have a number of short video clips (taken with my point-and-shoot's video feature) mixed in with the iPhoto albums. (iPhoto really does let me keep everything organized in one place!) If I understand correctly, Aperture won't let me store these in my Aperture library alongside the still-photos of the same subjects. Is this correct? If so, how have other people handled this?
5. Do EXIF tags get re-read upon import from iPhoto to Aperture? I've got a number of iPhoto files which I've retroactively geotagged with HoudahGeo. Will the tagging be lost (since iPhoto is not currently aware of the geotagging as the EXIF tags have not been re-read)... or will Aperture now recognize this metadata?
6. If worst-comes-to-worst and I give up on Aperture after a few months, how painful will it be to un-migrate back to iPhoto? More importantly, what album metada (e.g. events, albums, ratings, tags, notes, dates, hidden-ness, links between original and modified versions of a photo, iWeb references, etc.) will be lost? In other words, if I were to import everything from iPhoto to Aperture, wipe my iPhoto library clean, and then export everything back from Aperture to iPhoto, what information will have been destroyed?
Thanks in advance for any answers to this long list of questions!

Here are several observations (read: warnings) in case anyone else is considering migrating a significant iPhoto library to Aperture...
A) Pictures marked as "hidden" appear to be silently skipped over (along with video clips, as was expected) when importing an iPhoto library to Aperture. They do not appear in the relevant Aperture project regardless of the filtering options.
B) Both iPhoto originals and modifieds are imported. The former are given the keyword "iPhoto original" and the latter are given the keyword "iPhoto modified." Each pair of photos is put into a single Aperture "stack." Both photos are given the same tags/ratings (so, for example, the un-rotated, uncropped, poorly balanced original will show up alongside the nice clean "modified" if you were to filter for 5-star images), and both files are given identical "version names" (equal to the "name field" in iPhoto). In most cases the original -- not the modified version -- was set as the stack's "pick" and displayed when the stack was collapsed. *Significantly, I could find no way of creating a view in Aperture that showed one copy of each picture, with the "iphoto modified" version displayed for photos that had been modified in iPhoto and the original version displayed for photos that had never been modified in iPhoto!* (This is, of course, the way they are shown in iPhoto.)
C) My understanding of "stacks" is that they are designed to help organize multiple "tries" at the same shot (e.g., I want to make sure that nobody's eyes are closed in the group photo, so I press the shutter six times in quick succession -- I'm going to pick a "best" one will be mostly interested in that shot from then on). This is a fantastic idea! However things get confusing if you are already using stacks to track original and modified versions (as described above)... particularly if your stack should contain six pictures plus original versions of each. Plus, as I mentioned, the "original" version is usually the default "pick" in each stack.
D) After import, "iPhoto original" versions of portrait photos appear un-rotated. Normally, my cameras (including a Nikon D80, an iPhone, and others) mark photos' orientations and they are automatically displayed in the correct orientation. Aperture appears to consider this auto-rotation an iPhoto edit and helpfully displays the "iPhoto original" always in landscape.
E) Aperture may incorrectly import events whose names contain a "/" or a ".", so if your event names contain dates, rewrite them with "-"s before importing to Aperture.
F) Aperture does have a rough mouse-over-the-icon-to-flip-through view, similar to the "events" pane in iPhoto... although you will lose your choice of which photo serves as the default icon for each event when you import your library from iPhoto, and you cannot "hide" photos from appearing in the flip-through as you can with iPhoto.
G) Perhaps it's my inexperience with the program, but I could find no way to sort the project list by date (vs. alphabetically), nor could I find any way to make a correction to a single photo's date/time.
As a bottom line, remember that Aperture is definitely not "iPhoto Plus." It lacks a number of iPhoto's features, but in exchange gives you a number of really slick tools aimed at streamlining a digital photography workflow.
I'd also encourage people to think very carefully before moving a large, well-organized iPhoto library to Aperture. You may lose a fair amount of information, and the result will take a lot of work to "make pretty" again. It does look like a nice program, though. Are you ready to relegate all of your existing pictures to an iPhoto "pre-history" and start over with a blank -- but much fancier -- slate in Aperture?

Questions about Migration Assistant

I'm getting ready to move the contents of my G4 iBook to a new Intel-powered MacBook. I assume Apple's Migration Assistant can handle a lion's share of that job but I have a question...can I change the UserName (and ShortName) on the new computer and still migrate everything over with the Apple utility? For example, a particular concern is how to handle the information contained in Keychain. When that file gets moved over, how do I make it the default Keychain and set it to unlock with the new computer's password?
And any other issues I should be aware of when moving from a G4 machine?

Actually you cannot migrate a user folder that has the same name as one already created. However, because you are moving from a PPC to an Intel Mac there are some cautions of which you need be aware:
A Basic Guide for Migrating to Intel-Macs
If you are migrating a PowerPC system (G3, G4, or G5) to an Intel-Mac be careful what you migrate. Keep in mind that some items that may get transferred will not work on Intel machines and may end up causing your computer's operating system to malfunction.
Rosetta supports "software that runs on the PowerPC G3 or G4 processor that are built for Mac OS X". This excludes the items that are not universal binaries or simply will not work in Rosetta:
Classic Environment, and subsequently any Mac OS 9 or earlier applications
Screensavers written for the PowerPC
System Preference add-ons
All Unsanity Haxies
Browser and other plug-ins
Contextual Menu Items
Applications which specifically require the PowerPC G5
Kernel extensions
Java applications with JNI (PowerPC) libraries
See also What Can Be Translated by Rosetta.
In addition to the above you could also have problems with migrated cache files and/or cache files containing code that is incompatible.
If you migrate a user folder that contains any of these items, you may find that your Intel-Mac is malfunctioning. It would be wise to take care when migrating your systems from a PowerPC platform to an Intel-Mac platform to assure that you do not migrate these incompatible items.
If you have problems with applications not working, then completely uninstall said application and reinstall it from scratch. Take great care with Java applications and Java-based Peer-to-Peer applications. Many Java apps will not work on Intel-Macs as they are currently compiled. As of this time Limewire, Cabos, and Acquisition are available as universal binaries. Do not install browser plug-ins such as Flash or Shockwave from downloaded installers unless they are universal binaries. The version of OS X installed on your Intel-Mac comes with special compatible versions of Flash and Shockwave plug-ins for use with your browser.
The same problem will exist for any hardware drivers such as mouse software unless the drivers have been compiled as universal binaries. For third-party mice the current choices are USB Overdrive or SteerMouse. Contact the developer or manufacturer of your third-party mouse software to find out when a universal binary version will be available.
Also be careful with some backup utilities and third-party disk repair utilities. Disk Warrior (does not work), TechTool Pro (pre-4.5.1 versions do not work), SuperDuper (newest release works), and Drive Genius (untested) may not work properly on Intel-Macs. The same caution may apply to the many "maintenance" utilities that have not yet been converted to universal binaries.
Before migrating or installing software on your Intel-Mac check MacFixit's Rosetta Compatibility Index.
Additional links that will be helpful to new Intel-Mac users:
Intel In Macs
Apple Guide to Universal Applications
MacInTouch List of Compatible Universal Binaries
MacInTouch List of Rosetta Compatible Applications
MacUpdate List of Intel-Compatible Software
Transferring data with Setup Assistant - Migration Assistant FAQ
Because Migration Assistant isn't the ideal way to migrate from PowerPC to Intel Macs, using Target Disk Mode or copying the critical contents to CD and DVD or an external hard drive will work better when moving from PowerPC to Intel Macs.
Basically the instructions you should follow are:
1. Backup your data first. This is vitally important in case you make a mistake or there's some other problem.
2. Connect a Firewire cable between your old Mac and your new Intel Mac.
3. Startup your old Mac in Target Disk Mode.
4. Startup your new Mac for the first time, go through the setup and registration screens, but do NOT migrate data over. Get to your desktop on the new Mac without migrating any new data over.
4. Copy the following items from your old Mac to the new Mac:
In your /Home/ folder: Documents, Movies, Music, Pictures, and Sites folders.
In your /Home/Library/ folder:
/Home/Library/Application Support/AddressBook (copy the whole folder)
/Home/Library/Application Support/iCal (copy the whole folder)
Also in /Home/Library/Application Support (copy whatever else you need including folders for any third-party applications)
/Home/Library/Keychains (copy the whole folder)
/Home/Library/Mail (copy the whole folder)
/Home/Library/Preferences/com.apple.mail.plist (* This is a very important file which contains all email account settings and general mail preferences.)
/Home/Library/Preferences/ copy any preferences needed for third-party applications
/Home /Library/iTunes (copy the whole folder)
/Home /Library/Safari (copy the whole folder)
If you want cookies:
/Home/Library/Cookies/Cookies.plist
/Home/Library/Application Support/WebFoundation/HTTPCookies.plist
For Entourage users:
Entourage is in /Home/Documents/Microsoft User Data
Also in /Home/Library/Preferences/Microsoft
Credit goes to another forum user for this information.
If you need to transfer data for other applications please ask the vendor or ask in the Discussions where specific applications store their data.
5. Once you have transferred what you need restart the new Mac and test to make sure the contents are there for each of the applications.
Written by Kappy with additional contributions from a brody.
Be careful about what you migrate. Migrating an entire user folder is not a good idea when moving from PPC to Intel. Stick to your movable folders as described above.
PPC applications may not work after migration. If they don't then simply reinstall them.

Question about migrating data from mac pro to new macbook

Hello all,
I ordered a new macbook today and i'm very excited. It will be the first time i've had two apple machines simultaneously. My question is in regards to getting my new macbook all stocked up with the files and apps currently residing on my mac pro.
1. I don't know if by using migration assistant if the data is removed from the old machine and added to the new. I don't want that. I want everything currently on my mac pro to remain, unchanged.
2. I'd normally use target disk mode, but no firewire on the macbook, so, no dice there.
3. My startup disk and apps and such reside on one HDD in my mac pro, while my home folder, or user files, or whatever, reside on a separate HDD. will this cause a problem.
Your input is much appreciated.

It can be done with USB, but it is slower and less reliable.
Ethernet works great, IF you have two FUNCTIONAL machines. The great thing about Firewire Target Disk mode was that if the HD/OS was corrupted, or the computer was for some reason unbootable you could still get data off of it quickly, without tools or special equipment. Firewire Target disk mode has saved my rear several times on every machine I have owned.
The hard drive is fairly easy to remove on the aluminum Macbook. I would remove it and install it in an external Firewire enclosure temporarily to transfer your files quickly and reliably, then put the drive back in the Macbook.
Firewire allows two operating modes. One is asynchronous, like USB which suffers from latency, bus contention and collisions.
The other is isochronous mode, and it lets a device carve out a certain dedicated amount of bandwidth that other devices can't touch. It gets a certain number of time slices each second all its own. The advantages for audio/video should be obvious: that stream of data can just keep on flowing, and as long as there isn't more bandwidth demand than the wire can handle, nothing will interfere with it. No collisions, no glitches.

Question About Migrating to Office 365

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