Outlook client requirements and Exchange 2010/2013 coexistence

Good morning!
A question regarding Exchange 2010/2013 coexistence and the Outlook client requirement. I am upgrading and about to install Exhange 2013 into an existing Exchange 2010 Org. The current 2010 Org is patched to SP-3 and Outlook Anywhere is currently disabled.
I have Outlook clients that do not yet meet the minimun requirements for 2013 (Outlook 2007/2010). When I install my first 2013 server will it effect the current downlevel clients? The mailboxes are still in 2010 so my thoughts were since the Office upgrade
including Outlook has not yet taken place I didn't want to wait for them to at least get 2013 into the Org. The 2013 server should effect the clients until I configure the CAS on 2013 and only when they are at the proper version, is this correct? Does Outlook
Anywhere need to be first enabled and configured on the 2010 CAS before I attempt the confgiuration on the 2013 CAS? I just dont want to install 2013 and have Outlook connectivity issues right out of the gate...
Thanks in advance!

Outlook 2007 and 2010 are supported for Exchange 2013, you just need to push out the latest patches.
http://technet.microsoft.com/en-us/library/aa996719(v=exchg.150).aspx
If you configure the URLs properly in Exchange 2013 to URLs that point to the Exchange 2010 servers, your clients shouldn't try to talk to the Exchange 2013 server.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

Similar Messages

Search-Mailbox not attaching the infected emails in target folder and deleting the contents in exchange 2010 & 2013 coexistence

Dear All,
I have an issue with deleting circulated spam emails in my environment through search-mailbox
We have Exchange 2010 & 2013 CU5 environment
I followed the search and destroy document for exchange 2010
http://windowsitpro.com/exchange-server-2010/search-destroy-email-content-exchange-2010
Added the user to Discovery Management group
Created a new role group as below
New-RoleGroup "Mailbox Import-Export Management" -Roles "Mailbox Import Export"
Add-RoleGroupMember "Mailbox Import-Export Management" -Member Administrator
I ran the below commands
Search-Mailbox -Identity "[email protected]" -SearchQuery "Subject:'report'" -TargetMailbox "Administrator" -TargetFolder "Filter" -LogOnly -LogLevel Full
The above command gets completed successfully and sends the log report however im unable to see any attachments
Similarly the deletecontent also gets completed successfully and logs result. But it does not delete the infected emails
Search-Mailbox -Identity "[email protected]" -SearchQuery "Subject:'report'" -TargetMailbox "administrator" -TargetFolder "filter" -deletecontent -LogLevel Full
Any idea why it is not fetching the infected emails in zip file and why it is not deleting but it is able to log in the target folder
Any help much appreciated
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish (MVP)

Hi All
I managed to find the solution. Below command helped me in solving the issue
get-mailbox -ResultSize unlimited -IgnoreDefaultScope | search-mailbox -SearchQuery ‘Subject:"virus infected"’ -LogOnly -TargetMailbox administrator -TargetFolder filter -LogLevel Full
get-mailbox -ResultSize unlimited -IgnoreDefaultScope | search-mailbox -SearchQuery ‘Subject:"virus infected"’ -TargetMailbox administrator -TargetFolder filter -deletecontent -LogLevel Full
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

Exchange 2010/2013 coexistence: OWA proxy not working properly ":-( Something went wrong"

Hi
Exchange 2010 users are NOT able to connect to their mailboxes when they go through exchange 2013 OWA address. We get a message that says following ---> "Something went wrong"
Following is our URL. The address is pointing to 2013 CAS loadbalancer VIP. Outlook anywhere is working fine. What is going on?
Important: All my exchange 2010 / 2013 URIs are the same as suggested by Microsoft (Owa, ecp, activesync, ews, autodiscover): --> mail.domain.com/XXX

Hello Rawa,
Can you log on Exchange 2010 OWA using its localhost address?
Please make sure the intenralurl value is set to Exchange 2010’s local host name and set the Externalurl to Null.
http://technet.microsoft.com/en-us/library/bb310763(v=exchg.141).aspx
Thanks,
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Simon Wu
TechNet Community Support

Internal outlook client connectivity in exchange 2010 when coexist with exchange 2013

Hi all ,
on my side i would like to clarify few queries.
Say for instance i am coexisting exchange 2010 with exchange 2013 .Unfortunately if all of my exchange 2013 servers goes down .
Q1 .On that time will the internal outlook users having their mailboxes on exchange 2010 can be able to connect mailboxes without any issues ? In case if they face any issues what kind of issues will they be? Because why i am asking is we should have pointed
the autodiscover service to exchange 2013 during coexistence.
When an user closes and reopens the outlook after whole exchange 2013 environment failure ,outlook will first query the autodiscover service for the profile changes to get it updated on users outlook profile.In such case autodiscover service will not be
reachable and i wanted to know will that affects the internal client connectivity for outlook users having their mailboxes on exchange 2010.
Q2. Apart from outlook internal users connectivity ,what kind of exchange services(i.e owa,active sync,pop,external OA and imap) will get affected when whole exchange 2013 environment goes down during coexistence ?
I have read the below mentioned statement on this awesome blog but still i wanted to clarify with you all on my scenario.
http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx<o:p></o:p>
Internal Outlook Connectivity
For internal Outlook clients using RPC/TCP connectivity whose mailboxes exist on Exchange 2010, they will still connect to the Exchange 2010 RPC Client Access array endpoint.
For internal Outlook clients using RPC/TCP connectivity whose mailboxes exist on Exchange 2007, they will still connect directly to the Exchange 2007 Mailbox server instance hosting the mailbox.
Please share me your suggestions and that would help me a lot .
Regards
S.Nithyanandham

Hi Winnie Liang ,
Thanks a lot for your reply.
Scenario 1 : for internal outlook connectivity
We have below settings for exchange 2010 autodiscover.
mail.domain.com - will be the namespace for internal autodiscover URI for all the exchange 2010 cas serves
We are going to have below settings for exchange 2013 autodiscover.
mail.domain.com - will be the namespace for internal autodiscover URI for all the exchange 2013 cas serves
During coexistence mail.domain.com will be pointed to exchange 2013 cas servers . I mean to say if we try to resolve the mail.domain.com it will get resolved in to the exchange 2013 cas servers.
So on such case if anything happened wrong to the new environment or else if entire environment goes down .Do we face any issues while outlook users connect to existing mailboxes in exchange 2010 ?
Because why i am asking is ,on the below mentioned article i have read all the autodiscover request will go via exchange 2013 cas servers during coexistence.That means all the existing mailboxes in exchange 2010 will also have to query exchange 2013 cas
servers for autodiscover request.During the whole exchange 2013 environemnt failure whenever the user tries to close and open outlook .Outlook will first queries the autodiscover service for any changes happened on that particular mailbox and it will try to
get it updated on user profile.
http://blogs.technet.com/b/exchange/archive/2014/03/12/client-connectivity-in-an-exchange-2013-coexistence-environment.aspx
Would it be possible to make the exchange 2010 mailbox users to query only the scp points which belongs to the exchange 2010 cas servers for autodiscover request ?
Scenario 2: For exchange services
mail.domain.com - will be the namespace for all the exchange 2010 services (i.e owa,activesync,external outlook anywhere,pop,imap)
mail.domain.com - will be the namespace for all the exchange 2013 services (i.e owa,activesync,external outlook anywhere,pop,imap)
What about the above services will it get affected during whole exchange 2013 environment failure ?
Note : We are not facing this issue , i hope everything goes well in my environment while doing coexistence i am just asking this question on my own interest?
Regards
S.Nithyanandham
Thanks S.Nithyanandham

Missed Call Notification in Exchange 2010/2013 coexistence mode

Dear all,
Context:
Lync 2013 Enterprise Voice, Exchange 2010 and Exchange 2013 in coexistence mode
Waiting complete migration, some users are always on exchange 2010
UM role is installed on both exchange server
The exchange servers UM are attached to only one UM Dial Plan
Scenario :
A call to a lync user. The caller hang-up before user announcement
Problem: Missed call notification doesn't work for user on Exchange 2010 (it's work fine for user on Exchange 2013)
Voice Messaging works fine
Troubleshooting / SIP Traces:
SIP Info is always send to Exchange 2013 even if user is on exchange 2010
SIP Info sent from Lync FE to Exchange 2013 UM :
TL_INFO(TF_PROTOCOL) [0]6330.3AE8::02/12/2015-12:25:23.575.015c018e (S4,SipMessage.DataLoggingHelper:sipmessage.cs(774))[1718622663]
>>>>>>>>>>>>Outgoing SipMessage c=[<SipTlsConnection_13ECA29>], 192.168.5.110:49786->192.168.5.203:5061
INFO sip:outlook.mydomain.com:5061;ms-fe=exchange2013-UM.mydomain.localdomain;transport=Tls SIP/2.0
FROM: <sip:A410AA79-D874-4e56-9B46-709BDD0EB850>;epid=8C75BE2D95;tag=35c2d8a65a
TO: <sip:exchange2013-UM.mydomain.localdomain;opaque=app:rtcevent;transport=tls>;epid=C4C2F4F6BA;tag=ac126413f
CSEQ: 43 INFO
CALL-ID: 535a07e2-8e82-4d13-8e03-bf43ad97602d
MAX-FORWARDS: 70
VIA: SIP/2.0/TLS 192.168.5.110:49786;branch=z9hG4bKd66442be
CONTACT: <sip:LyncFE-2013.mydomain.localdomain;transport=Tls>
CONTENT-LENGTH: 454
USER-AGENT: RTCC/5.0.0.0 Inbound Routing (Microsoft Lync Server 2013 5.0.8308.726)
CONTENT-TYPE: application/ms-rtc-usernotification+xml
- <UserNotification>
       <User>sip:[email protected]</User>
       <EumProxyAddress>EUM:[email protected];phone-context=UMDialPlan.mydomain.localdomain</EumProxyAddress>
       <Time>2015-02-12 12:25:23Z</Time>
       <Template>RtcDefault</Template>
    + <Event type="missed">
</UserNotification>
------------EndOfOutgoing SipMessage
Answer from Exchange 2013 UM
TL_INFO(TF_PROTOCOL) [1]6330.2DF4::02/12/2015-12:25:23.642.015c2481 (S4,SipMessage.DataLoggingHelper:sipmessage.cs(774))[1718622663]
<<<<<<<<<<<<Incoming SipMessage c=[<SipTlsConnection_13ECA29>], 192.168.5.110:49786<-192.168.5.203:5061
SIP/2.0 200 OK
FROM: <sip:A410AA79-D874-4e56-9B46-709BDD0EB850>;tag=35c2d8a65a;epid=8C75BE2D95
TO: <sip:exchange2013-UM.mydomain.localdomain;opaque=app:rtcevent;transport=tls>;tag=ac126413f;epid=C4C2F4F6BA
CSEQ: 43 INFO
CALL-ID: 535a07e2-8e82-4d13-8e03-bf43ad97602d
VIA: SIP/2.0/TLS 192.168.5.110:49786;branch=z9hG4bKd66442be
CONTENT-LENGTH: 0
SUPPORTED: ms-dialog-route-set-update
SERVER: RTCC/5.0.0.0 MSExchangeUM/15.00.0995.028
ms-diagnostics-public: 15642;reason="Lync SIP INFO notifications are not supported for legacy users. User: EUM:[email protected];phone-context=UMDialPlan.mydomain.localdomain"
------------EndOfIncoming SipMessage
Gerald Cheminant

Hi,
This behavior is by design. Exchange 2010 server is not going to accept any SIP messages from Exchange 2013 server because it is not listed as UM IP Gateway. Therefore, even if Exchange 2013 redirected the SIP INFO packet to Exchange 2010, it will fail.
During migration\coexistance scenario, this feature (Missed call notifications from Lync server) will not work for legacy users whose mailbox is still in Exchange 2010.
Best Regards,
Eason Huang
Eason Huang
TechNet Community Support

Exchange 2010 & 2013 coexistence mail flow between servers

Hi Everyone,
I have an exchange 2010 server which I am trying to move away from. I have installed 2013 and it seems to be working well. I have successfully moved a mailbox over to 2013 without any issues.
The problem i have at the moment is that a user who has their mailbox on the 2010 server can send to the user on the 2013 server. However the 2013 user cannot reply.
Any ideas?

Yes, some issues with client connectivity are related to Outlook.
Exchange Blog:
www.ntweekly.com
MCSA, MCSE, MCITP:SA, MCITP:EA, MCITP:Enterprise Messaging Administrator 2010,MCTS:Virtualization

Outlook Client Issues following Exchange 2010 Rollup 8

Update Rollup 8 For Exchange 2010 SP3 (KB2986475) was applied to our Exchange server last night.
All appears to be fine, but users are having all kind of trouble using the Outlook Client to connect to their mailboxes.
Randomly they can't view certain folders (Inbox/Sent Items). Can no longer save to their Calendars. Errors relating to permissions and Outlook notifications?!?!?!?!
This is ONLY when using the Outlook Client - webmail works fine.
There are also no issues when running Outlook in safe mode.
Any advice would be very much appreciated.
Thanks
David

The following has been posted onto the Exchange team site:
http://blogs.technet.com/b/exchange/archive/2014/12/09/exchange-releases-december-2014.aspx
Update 12/10/2014:
An issue has been identified in the Exchange Server 2010 SP3 Update Rollup 8. The update has been recalled and is no longer available on the download center pending a new RU8 release. Customers should not proceed with deployments of this update until the
new RU8 version is made available. Customers who have already started deployment of RU8 should rollback this update.
The issue impacts the ability of Outlook to connect to Exchange, thus we are taking the action to recall the RU8 to resolve this problem. We will deliver a revised RU8 package as soon as the issue can be isolated, corrected, and validated. We will publish
further updates to this blog post regarding RU8.
This issue only impacts the Exchange Server 2010 SP3 RU8 update, the other updates remain valid and customers can continue with deployment of these packages.
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
Blog:
http://blogs.technet.com/rmilne
Twitter:   LinkedIn:
  Facebook:
  XING:
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Exchange 2010/2013 coexistence published in TMG 2010

Environment:
Two Windows 2008 R2, Exchange 2010 SP3 servers, currently holding all mailboxes
Two Windows 2012 R2, Exchange 2013 SP1 servers, setup in progress
Two Windows 2008 R2, TMG 2010, V7.0.9193.540 publishing both Exchange 2010 servers.
Scenario:
I need to continue having Exchange 2010 setup in TMG as is as the mailbox migration to 2013 will take weeks if not months and I have a project requirement to have Exchange Database Availability Group (DAG) functionality for all mailboxes throughout the project,
so 4 servers are an absolute must. So I need to add Exchange 2013 in TMG and not just replace the 2010 setup with the 2013 setup and I cannot run one 2010 and one 2013 server.
Questions:
1. I currently only have 2 public IP addresses available to SMTP, mapped to the external interfaces of TMG, to allow my environment to be able receive emails on 4 Exchange servers (two 2010 and two 2013) I need to have 4 public IP addresses, is that correct?
2. Does anyone have a good general guide/blog for doing this (setting up Exchange 2013 in TMG in a coexistance scenario)?
This is nice, but doesn't really approach it from a coexistance scenario:
http://blogs.technet.com/b/exchange/archive/2012/11/21/publishing-exchange-server-2013-using-tmg.aspx
Thanks!

Hi Trana,
In TMG you can use single IP address to publish multiple Web address and below are the options which you can explore.
Hope your OWA ECP etc are Https
You need a SSL certificate which has all the URL SAN entry of both old and new Exchange server.
Create a listener and select the IP address (Say public IP address 195.219.x.x)
Link the SSL certificate
Public DNS entry
A record , Single IP
195.219.x.x
Point to
Owa1.exchange1.com   - Old Server
195.219.x.x
Point to
ECP1.exchange1.com     - Old Server
195.219.x.x
Point to
ECP2.exchange2.com      - New Server
195.219.x.x
Point to
Owa2.exchange2.com     - New Server
Create a Web publishing rule as below
Old server Exchange 1
Owa1.exchange1.com
ECP1.exchange1.com
One Web publishing Rule with all the URL added on it and link the Rule with the listener we created
Point the Web publishing to Exchange1.com server which is old
New server Exchange 2
Web publishing Rule with all the URL added on it and link the Rule with the listener we created
Point the Web publishing to Exchange2.com server which is New
ECP2.exchange2.com
Owa2.exchange2.com

Exchange Server 2013 OAB Web Distribution Configuration in Exchange 2010 & 2013 Coexistence.

Hi,
We have OAB Issue for Exchange 2010 Users in our Organization.
We have Exchange 2010 and Exchange 2013 Coexistence.While Checking in Exchange Server 2010 Server OAB properties in Org Configuration--> Mailbox-->OAB Properties -->Distribution we are not seeing any CAS servers and Its Grayed Out.
Please let us know How to add Exchange 2010 CAS in Exchange 2013 Web distribution.

They made alot changes with the OAB in Exchange 2013, and it doesn't really function in the same manner as it did in 2010. It might be best to take a look at the following blog posts from the Exchange Team, they should give you a better understanding
on how it works and how to manage it going forward.
http://blogs.technet.com/b/exchange/archive/2012/10/26/oab-in-exchange-server-2013.aspx
http://blogs.technet.com/b/exchange/archive/2013/01/14/managing-oab-in-exchange-server-2013.aspx
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread

ActiveSync 500 error and Exchange 2007/2013 coexistence

Hello,
We have Exchange 2007, and we've deployed Exchange 2013 and coexistence appears to be working. We have done a small pilot migration of 11 users, and I have 2 of those users that are not able to get iPhone/ActiveSync working. OWA and Outlook access
work without a problem. https://testconnectivity.microsoft.com/ is telling me "The test of the FolderSync command failed." and "Exchange
ActiveSync returned an HTTP 500 response (Internal Server Error)"
The error I'm receiving on the mailbox server event log is:
An exception occurred and was handled by Exchange ActiveSync. This may have been caused by an outdated or corrupted Exchange ActiveSync device partnership. This can occur if a user tries to modify the same item from multiple computers. If this is the case,
Exchange ActiveSync will re-create the partnership with the device. Items will be updated at the next synchronization.
URL=
--- Exception start ---
Exception type: Microsoft.Exchange.AirSync.AirSyncPermanentException
Exception message: A null value was received for the NTSD security descriptor of container CN=ExchangeActiveSyncDevices,CN=LASTNAME\, FIRSTNAME.,OU=XXX,OU=People,DC=DOMAIN,DC=local.
Most articles I've found with this issue say to confirm that "Inherit parent permissions" is check on the AD object, but that is already checked?
The funny thing is that most of our pilot users don't have this issue. It is only for some of them.
Any help is appreciated.

An update here, I was able to get the 2 pilot user's iPhone/ActiveSync access working by adding the following permissions by hand:
Add Exchange Servers, in Apply onto select
msExchActiveSyncDevices objects (note it's plural) and selecting
Full Control.
Once I did this, my problems went away.
So the big question is why aren't these permissions in place already? Isn't this something that the adprep/domain prep should have taken care of?
Thanks!

Exchange 2010 - 2013 Coexistence Issues

I am migrating from Exchange 2010 to Exchange 2013, the Exchange 2013 is built in a different Geo-location site with its dedicated domain controllers in the new site. I have confirmed the mail flow between Exchange 2010 and 2013 mailboxes. I am able to discover
Exchange 2010 servers from 2013 environment via Get-ExchangeServer shell command. However, I am not to discover Exchange 2013 servers from 2010 environment.
I need to configure Outlook Anywhere and Service Connection Point (Autodiscover) on Exchange 2010 to accept connections from Exchange 2013 servers.
Any suggestions would be much appreciated, thanks!

Hi ,
Please have a look in to the below mentioned blog after reading that blog i came to know few things .
I am not sure ,i thought exchange 2013 servers will not be displayed in exchange 2010 management shell.
Better and advisable method is to configure your exchange 2010 and 2013 servers via EAC or Shell in exchange 2013.
http://exchangeserverpro.com/exchange-server-2010-2013-migration-managing-co-existence-environment/
Taken from the above blog :
You can’t use the Exchange 2010 EMC to manage Exchange 2013 objects and servers. While customers upgrade to Exchange 2013, we encourage them to use the EAC to:
Manage Exchange 2013 mailboxes, servers, and corresponding services.
View and update Exchange 2010 mailboxes and properties.
View and update Exchange 2007 mailboxes and properties.
We encourage customers to use Exchange 2010 EMC to create Exchange 2010 mailboxes.
We encourage customers to use Exchange 2007 EMC to create Exchange 2007 mailboxes.
Customers can continue to perform management tasks using the Exchange Management Shell and script tasks.
Regards
S.Nithyanandham
Thanks S.Nithyanandham

External emails not received after shutdown of Exchange 2010 in coexistence with Exchange 2013

I have exchange 2013 and exchange 2010 in coexistence mode. All mailboxes have been moved to Exchange 2013 and firewall/spamfilters already pointed to Exchange 2013 CAS server. I can receive/send from and to external addresses, however when I shutted down
the Exchange 2010 all incoming external mails were not received. What could be the cause?

Start by re-checking how the device that takes the traffic from the external MX IP to internal is configured.
Sniff the traffic to ensure that it is hitting 2013 directly.
Cheers,
Rhoderick
Microsoft Senior Exchange PFE
Blog:
http://blogs.technet.com/rmilne
Twitter:   LinkedIn:
  Facebook:
  XING:
Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Outlook 2010 and Exchange 2010 SP3

Hello,
we are planning to upgrade from Exchange 2010 sp1 to SP3, most of client PCs has Windows XP sp3 and Oultook 2010 with VSTO addins working with mapi properties.
I need to know if there are any known issues between this client environment and Exchange 2010 SP3 ??
thanks a lot,
Mauricio.
Mauricio

Windows XP is not supported in any scenario, so yes, I'd call that a known issue.
Mike Crowley | MVP
My Blog --
Planet Technologies

Exchange 2013 and Exchange 2010 coexistense

We have a and exchange 2010 organization with SP3 on most servers except for one 2010 CAS server that still requires SP1 for the purpose of legacy application compatibility. Can we introduce exchange 2013 in the org or will the setup detect
that there is an exchange 2010 server still with SP1 and fails to continue?

Hi,
For Exchange 2013 coexistence with Exchange 2010, the mininum version of Exchange server is Exchange 2010 SP3 on all Exchange 2010 servers in the organization. For more information about it, please refer to the Coexistence of Exchange 2013 and earlier versions
of Exchange server part in the article below:
http://technet.microsoft.com/en-us/library/jj898583(v=exchg.150).aspx
Personal suggestion, please upgrade your legacy application to the latest version which is supported with Exchange 2010 SP3 or higher Exchange version.
Regards,
Winnie Liang
TechNet Community Support

Problems with a shared calendar using Outlook 2007 and Exchange 2010

Hello all,
We are having a problem with sharing a calendar using Outlook 2007 and Exchange 2010.
I will start with some background. I have just started my position with this company. I have been working with networks for awhile at the small business level. I have not had much production experience with exchange. There is only myself and my supervisor
who has inherited a midsized network which was built by five previous techs that are no longer with the company. Of course, the previous techs did not leave much documentation, so the original hows and whys for our system setup has been lost.
One of the managers has a calendar she shares with some of our users. I believe this calendar has been in use since sometime in 2006. A mailbox was created to hold this calendar to keep it separate from the managers calendar. I am not sure what version
of exchange they were using at that time, but I assume there was one or two migrations of it getting to its current state on our exchange 2010 server. At some point it was observed that the other workers she was sharing with were not able to access it correctly.
I am not fully sure what the original problem was (possibly some people not being able to see or connect to the calendar), but it was decided to give everyone who needed access to this calendar full access permissions through exchange. Correct me if I
am wrong, but I believe that gave everyone connected the ability to do anything with the calendar. Of course the manager was not happy about that. This is where I started working on the problem.
I removed everyone, except the manager who wants to control the calendar, from having "Full Access Permissions". This did have the effect of making some people just able to see the calendar and not make changes. Though there were others that were
able to connect to the calendar who I thought would not be able to. The manager that originally created the calendar did try to manage access to it through the Outlook interface, though it currently does not seem to be fully in effect.
So, to get to the point of what we are trying to do, is there a way to get the original manager back into control of the calendar though Outlook? It would be preferred to be able to keep the history of what they tracked of this calendar, so starting a new
one would be something we would rather avoid. After that, getting all of the users that need to connect to the calendar reconnected with the correct access permissions and making sure they are all synchronized.
I realize this is a big mess, and your help would be greatly appreciated.

Hi Nigel,
How is the impact, just one user or all users, Outlook or OWA?
If just one user, it seems like an issue on the Outlook Client side.
Please trying to re-create new profile to fresh the caches.
Please runing Outlook under safe mode to avoid some AVs, add-ins and firewall.
Found a similar thread for your reference:
Calendar Sharing not available error message
http://social.technet.microsoft.com/Forums/exchange/en-US/d9b33281-d7bb-4608-8025-16fb26643d0d/calendar-sharing-not-available-error-message?forum=exchangesvrclientslegacy
Hope it is helpful
Thanks
Mavis
Mavis Huang
TechNet Community Support

Outlook client requirements and Exchange 2010/2013 coexistence

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