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I have started to get regular crashing of my Office for Mac products, particularly Outlook, since Mac OS Sierra updated from 10.12.2 to 10.12.3. Microsoft support have tried all the known workarounds without success, but as the problems started when 10.12.3 was installed I wanted to see if rolling back would fix the issue.
MacBook Air, macOS Sierra (10.12.3)
Please refer to macOS Sierra: Revert to a previous macOS version.
Assuming you have no Time Machine or equivalent backup of your essential files and other documents, create one now because you will need to completely erase that Mac in order to downgrade its operating system from Sierra to any earlier version. To learn how to use Time Machine read Use Time Machine to back up or restore your Mac.
After you have that backup and are satisfied with your ability to recover its files — or you decide that you do not need or want any of the information on that Mac, and understand that it will be irretrievably and forever lost, continue with the steps below.
Choose one of the Mac OS Extended (Journaled) formats.
That is where you will be prompted for an Apple ID (although you can skip that step if you choose).
Then, restore your files from the backup. Beware that if any of them have been updated to work with Sierra, they may no longer work with El Capitan or earlier OS X versions.
Lastly, you would be far better off fixing what's wrong with your Mac than to downgrade to an earlier operating system. If you want to do that, and I strongly suggest you do, please write back for instructions.
Please refer to macOS Sierra: Revert to a previous macOS version.
Assuming you have no Time Machine or equivalent backup of your essential files and other documents, create one now because you will need to completely erase that Mac in order to downgrade its operating system from Sierra to any earlier version. To learn how to use Time Machine read Use Time Machine to back up or restore your Mac.
After you have that backup and are satisfied with your ability to recover its files — or you decide that you do not need or want any of the information on that Mac, and understand that it will be irretrievably and forever lost, continue with the steps below.
Choose one of the Mac OS Extended (Journaled) formats.
That is where you will be prompted for an Apple ID (although you can skip that step if you choose).
Then, restore your files from the backup. Beware that if any of them have been updated to work with Sierra, they may no longer work with El Capitan or earlier OS X versions.
Lastly, you would be far better off fixing what's wrong with your Mac than to downgrade to an earlier operating system. If you want to do that, and I strongly suggest you do, please write back for instructions.
If you have a Time Machine backup that predates the upgrade you can restore from that. You will lose any data you have created since the update.
How do I roll back an OS update?
