Visit your Account Settings, then Advanced for the mail account that you are having trouble with.
This can be located at one of the following: The solutions in this article as specific to these updates and are not meant to resolve all issues; only the ones caused by these updates that were pushed out previously.
Until this is fixed in a future build, it is recommended that affected users revert to build 16.0.7571.2109.
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To do so, complete the following steps: Be sure to back up any existing emails or transfer to an offline location before making this change.
Replacing the root folder can possibly cause the loss of saved emails in the account.
It isn’t very common that Outlook doesn’t close on it’s own.
Be sure the service is correctly installed and configured.
It has come to our attention that many Outlook 2013 and Office 365 users are having issues within synchronizing IMAP folders recently.
This appears to be happening across all hosts due to a recent update that Microsoft has pushed out to all of its users.
As a result, it's stability also relays on 3rd party software (programs or drivers) - a badly designed piece of software can easily cause Outlook to require more and more system resources, until it crashes or it stops responding properly. If the restart doesn't solve anything, try to close 3rd party programs that run at the same time with Outlook, maybe one of those programs is causing Outlook to require more resources.
If the situation doesn't change, see below for more potential causes/solutions.