How do I revert to Snow Leopard?

My other half has just installed Lion and did not realize that his MS Office and other software would not work. Naturally he has no backup so how do I go about reverting his machine to Snow Leopard?

In Apple Mail pull down File > Import Mailboxes. This will open a dialog with one of the options being MS Entourage. I don't know what the process looks like from there since I've never imported from Entourage but this may be a solution for you. Although the dialog does say Entourage will launch, so it may not work. Worth a try, though.
The process isn't always perfect, and can take a while depending on how much email and other data is in there. However, there might be reason for using Entourgage/Outlook rather than Apple Mail/iCal/Address Book. Certainly another option worth considering though.
I have migrated many users down this road and can tell you that there can be a world of hurt at the end if there are any issues with the main identity, (and being Entourage there are always issues with the main identity, unless you've only been using Entourage since yesterday, or less)
Sadly, I've found this to be the case. If you can manage without Entourage/Outlook it is probably better to do so. What better time to make the transition?

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How do I revert to Snow Leopard from Mountain Lion? I do not have the setup disk that came with my MacBook but I do have the Snow Leopard software.

I upgraded to Mountain Lion and very much regret this move. I cannot use Parallels or Bootcamp for Windows XP which I need for some of my 'older' accessories. How do I revert from Mountain Lion back to Snow Leopard? I have the Snow Leopard software but I do not have the original setup software disk that came with the MacBook (leant to a friend and never seen again).

If you do revert to Snow Leopard, be aware of this "feature" I used with my 2009 MacBook Pro:
When it had the original OS (Leopard, I believe) I set up Bootcamp with Windows XP. I also installed Parallels and use the Bootcamp partition for Windows XP within Parallels.
I then upgraded to Snow Leopard and all was fine.
I then upgraded to Lion and still my Bootcamp partition works for Windows XP and also for Parallels.
I have not upgraded to Mountain Lion so I cannot speak to whether or not the Bootcamp paritition of Windows XP will continue to work. If you do and it works, LET US KNOW!

How can I revert to Snow Leopard from Mountain Lion on a 2013 iMac?

I have a brand new 27" 2.9Ghz iMac, bought a few days ago, equipped with Mountain Lion. I'm using it for recording, and at the time, my recording software and hardware are incompatible. On Snow Leopard, however, it all runs flawlessly. I know I can't simply revert to Snow Leopard, as there is some sort of firmware that blocks these types of downgrades. Can I partition the internal hardrive and install Snow Leopard and boot from that partition? I have no real use for Mt. Lion for the time being, so I wouldn't need to boot them both simultaneously or even go back and forth. I just want Snow Leopard...any help would be much appreciated. Thanks

Welcome to the Apple Support Communities
You have different problems with a Late 2012 iMac and Snow Leopard:
1. The firmware doesn't allow you to run it.
2. Snow Leopard isn't compatible because it hasn't got the drivers for the hardware of the iMac. Furthermore, you can only run OS X 10.8.1, 10.8.2 or 10.8.3 on a Late 2012 iMac at the moment, because older versions haven't got the drivers it needs.
3. It's illegal.
As you can see, you can't run Snow Leopard natively. If this is a requirement, I suggest you to return your iMac and search a Mid 2011 iMac with Snow Leopard (there are some Mid 2011 iMacs that came with Snow Leopard, although most of them came with OS X Lion). If you don't find anything, buy a Mid 2010 iMac.
Another possibility is to buy Snow Leopard Server and install it on a virtual machine, but I doubt it's legal

How can I revert to snow leopard

I installed Lion. It took several hours!
I found out after, that several softwares I was currently using do not work any longer (FileMaker, Excel, Word).
Can I downgrade now? Or would it be possible to run both systems on the same machine?
I have previouly saved my disk with Time machine.

You can downgrade, but it's not easy. Search these forums for "revert to snow leopard" for numerous answers.
However, MS Office can be made functional by simply upgrading to Office 2011. Also, my ancient copy of FileMaker Pro 8.5 seems to be working fine in Lion. What version are you using? Of course, the ultimate solution would be to simply upgrade FMP as well. If you're going to upgrade your system, you're going to also have to upgrade your other software from time to time.
To run both systems, you could create another partition on your hard drive with Snow Leopard, and then choose which system to boot into. That would be inconvenient, though. You'd be better off to simply commit to Lion and upgrade your other software or bite the bullet and revert to SL. Of course, if you do the latter, you're stuck with that machine and that system until you ultimately are forced to do the former by hardware failures or whatnot.

How can I revert to Snow Leopard on my Air?

I have a macbook air running lion, a snow leopard install CD, and a mac pro also running lion. How do I install snow leopard on my air from that CD? What happened to the utility that did this stuff? Target disk mode requires a firewire port... What am I supposed to do?

Here's a suggestion if you don't wish to look for the utility on your Snow Leopard DVD. Get an 8 GB USB flash drive. Format for OS X and clone your Snow Leopard DVD to the flash drive using your other computer.
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Clone using Restore Option of Disk Utility
Open Disk Utility from the Utilities folder.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the USB flash drive. Source means the Snow Leopard DVD.

How do I revert to Snow Leopard from 10.7.4?

I have a Time Machine back-up of all my files on an external HD but, unfortunately, done AFTER installing 10.7.4 (which is a REAL BUMMER!).
If I reformat my MacBook Pro and do a clean install of 10.6.8, will it allow me to recuperate all my mail and docs backed-up in 10.7.4?
I mean, at a certain point, will it ask if I want to get my stuff from some other disk of from a Time Machine back-up?

That of course did not answer eve the begnnning of my question, since Mail in all the windoz-like "lions" is NOT compatible with Snow Leopard Mail, and a MAJOR workaround is needed.
Anyway, I solved ALL of my problems and UPGRADED TO SNOW LEOPARD, a much faster mac-like system that doesn't eat your RAM, you battery and is much less intrusive than BOTH lions, which are windoz-like, slow, eat memory and battery and...it's your falut, just like in PC H*E*L*L*...

How do I revert to Snow Leopard from Yosemite on late 2008 MacBook with no optical drive?

Late 2008 MacBook. I don't need to back up, just to go back from Yosemite to Snow Leopard without a working optical drive.
Thank you.

If you have a Time Machine backup from Snow Leopard, then use it to restore from. Other than that, you will need to get an optical drive and run your install disks that came with your computer. Of course, you will need your Snow Leopard updater if you still have it since you can't get it from the App Store.
I may be wrong about it not being available. I found a like from apple where you can still purchase it. It may still work.
http://store.apple.com/us/product/MC573Z/A/mac-os-x-106-snow-leopard

How do I uninstall OS Lion and revert to Snow Leopard

Hi all, I need to use Microsoft Office Mac Version in my work. And OS X Lion don't support that. I am desparate to know how do I unistall the OS X Lion, and revert to Snow Leopard so that I can resume working on my MacBook Pro. Please help.....

MS Office for mac 2004 is indeed incompatible I believe but 2008 onwards isn't. You should consider upgrading your MS Office to be compatible. Apple is not responsible for making 3rd party software compatible with its OS, its the 3rd party developers who updates their softwares and drivers.
You can certainly revert back to Lion BUT it depends what type of machine do you have?Did you purchase Lion as an upgrade?is your machine Lion preinstalled?

How does one un-install Lion and revert to Snow Leopard?

Anyone know how to un-install Lion and revert to Snow Leopard?

Downgrade Lion to Snow Leopard
1. Boot from your Snow Leopard Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Quit DU and return to the installer. Install Snow Leopard.
This will erase the whole drive so be sure to backup your files if you don't have a backup already. If you have performed a TM backup using Lion be aware that you cannot restore from that backup in Snow Leopard. I suggest you make a separate backup using Carbon Copy Cloner 3.4.1.

Before Mac OS X lion install I had over 50% free hard drive space on new MBP, but now my hard drive is full without me doing anything! How do I fix this??? Or should I just revert to Snow Leopard???

Before Mac OS X lion install I had over 50% free hard drive space on new MBP, but now my hard drive is full without me doing anything! How do I fix this??? Or should I just revert to Snow Leopard???

Sounds like the Time Machine Local Backup. Try turning Time Machine Off in System Preferences to verify.
See: OS X Lion: About Time Machine's "local snapshots" on portable Macs
But, your real problem is
I forgot to mention that I tried to use Disk Utility to Verify Disk, but it cannot. I get red errors that say the MacHD is corrupt and needs to be repaired. It says that in order to do this I need to use the Disk Utility on the install disk, but Lion doesn't have one!
Boot into Lion's Recovery (Hold ⌘R on Boot), select Disk Utility and then select Macintosh HD and click [Repair Disk]
Tony

How to revert to Snow Leopard from time machine on Yosemite Device.

Hello everybody,
Essentially I need to revert back to OS Snow leopard on my new macbook that has Yosemite installed (bought secondhand) as a few of my DJ programs (Rekordbox) are not co-operating with the new OS. I have the back up on a hard drive made with Time Machine, is there any way I can do this?
My old Macbook pro is still working, its just the backlight has gone out, so I have to use a torch on the back to see what I'm doing. Everything still functions correctly on my old device, and I can use the carbon clone copy if need be. Really just need my old laptop's os/files on this new device with Yosemite on it.
Thanks in advance.

Do a backup, preferably 2 seperate ones.
Revert to a Previous OS X
Revert to Snow Leopard
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.

I have Mac OS X 10.5.8. How do I upgrade to Snow Leopard to upgrade to Mountain Lion?

I have Mac OS X 10.5.8. How do I upgrade to Snow Leopard to upgrade to Mountain Lion?

Your machine is likely too dated to run 10.8 at all , or if it does will run slow.
It won't run your PPC based software or hardware drives for external hardware.
10.6 will run your PPC software and likely is best for that machine performance speaking, Software Update to 10.6.8 and stay there.
You better do your research first.
Things to consider before upgrading OS X
Or else get this
Why is my computer slow?
and then have to do this
How to erase and install Snow Leopard 10.6
or this
How to revert your Mac to Snow Leopard
but before you do anything, you really need to do this
Most commonly used backup methods

I have Mac OS X 10.5.8. How can I upgrade to Snow Leopard?

I can't find any information here.
Any info would be greatly appreciated.
Thanks

Your machine is likely too dated to run 10.8 at all , or if it does will run slow.
It won't run your PPC based software or hardware drives for external hardware.
10.6 will run your PPC software and likely is best for that machine performance speaking, Software Update to 10.6.8 and stay there.
You better do your research first.
Things to consider before upgrading OS X
Or else get this
Why is my computer slow?
and then have to do this
How to erase and install Snow Leopard 10.6
or this
How to revert your Mac to Snow Leopard
but before you do anything, you really need to do this
Most commonly used backup methods

Why I reverted to Snow Leopard from Lion....

Mac Mini (Late 2009)
2GHz Processor
2G RAM
320GB Hard Drive
I've loved this computer from the moment I got it....used...on eBay...Leopard disk included, but wiped clean by seller. My second Apple purchase after the iPhone 4. I loved the way that Apple products did away with the annoying "thinking time" so familiar to PC users....they just worked (bleugh!). They didn't get sick, they didn't slow down, they made your whole computing experience less computational and more creative.
Snow Leopard, when it came out, made my second hand Mac even better, took up less space and just seemed to run extremely smoothly. As a musician, I record into CPU-intensive programs like Ableton, and yet, my ickle 2 Gig box handled the loads superbly.
Lion, on the other hand has turned out to be a major disappointment....
After the initial 'excitement' of side-swiping webpages had worn off, I began to notice that the computer was very slow, with that beachball appearing much too frequently for my tastes...I got several spinning hourglass flashbacks! I thought I had left those days behind me....Ableton started using massive amounts of CPU and doubling it's RAM consumption, to the point where the mouse would freeze, drop-down menus would appear blank, basically the whole system freezing until I closed the offending program...in this case Ableton. I was seriosuly considering upgrading my RAM, but my gut instinct was that Lion was causing it. I checked the forums, and found a few incidents of people with similar problems, saying Lion was the culprit. They were being arrogantly dismissed as fools for daring to criticise anything Apple related. I'm no expert, but I know when my computer is not working the way it should. So I searched YouTube for the method of reverting to Snow Leopard...sat up late last night completing it...but it was well worth it. I'm back on 10.6.8
I now love my Mac Mini again.....all my programs run faster, RAM and CPU usage is down, no more spinning hourglasses, I mean BEACHBALLS
My verdict:
Snow Leopard is a fantastic operating system.
Lion is not.
I don't know or care for the politics of why it is not, but a few gimmicky tricks and full-screen apps do not even begin to make up for the frustration of using a slow, buggy operating system, that developers say was rushed out and no't tested properly...I believe them!
I have heard a few people refer to possible power management problems with Lion....sounds plausible
Lion is Apple's Vista.
Cheers for reading my first post
Paul

Welcome to the crowd.
I reverted my MBP 3,1 back to Snow and the Lion black death and video artifacts are gone.
Yes, Lion certainly needs to go back into the oven for more cooking, unfortunately they release it and inflict millions with it and don't have a easy, user friendly method to revert.
Not only that they make UI changes that people just have to blindly accept, with no option to turn them off.
Things needs to change, even Windows has System Restore and some measure to revert some features back to what they were and let change be accepted gradually.
Storage drives are fat, some with as much as 750GB, there isn't a reason in the world not to provide two OS''s on one drive to ease the transition between the two. Let those who can afford to beta test with arrows in their backs do so.
Let the rest of us who just want our computers to work left alone, we don't want new features if it they don't work reliably yet.
The way it is now, when a new OS is about to be released, one has to run out and buy new hardware prematurely because the whole next year will be nothing but misery.
Really nice way to treat newcomers to the Mac experience.
Change and improvement is welcome, but it has to be gradual and reliable. Not sudden and drastic.

I used my snow leopard disk to erase my hard drive. Now I want to eject the snow leopard disk to clean install from the lion boot disk I made. How do I eject the snow leopard disk?

I used my snow leopard disk to erase my hard drive. Now I want to eject the snow leopard disk to clean install from the lion boot disk I made. How do I eject the snow leopard disk? It is the start up disk and I can't figure out how to get it out of the computer so I can put my lion boot disk in. Thanks

turn the mac all the way off. turn the mac on by pressing the power button. as soon as the apple logo appears, pres and hold your mouse button(trackpad mouse clicker etc...) until the CD comes out.

How do I revert to Snow Leopard?

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