“Actually, the November update for Outlook 2013 (KB2837618) fixes a whole lot of IMAP issues and is highly recommended.Amongst others, the update makes sure that IMAP accounts will not repeatedly completely resynch folders, will not create duplicates of default folders, will more reliably map the special server folders and make it less likely that folders will get marked as “This computer only”.However, it is now also more important than ever to correctly set the Root Folder Path for your mailbox when your IMAP server requires it.
Make sure that you are subscribed to the folders which you want to see and sync in Outlook.
In rare occasions, you might still encounter some issues with synching.
This also includes your Calendar and Contacts folder when they are stored within the ost-file of your IMAP account.
To prevent this, you can change your configuration of Outlook 2013 in such a way that it behaves like Outlook 2010 and previous where the Calendar and Contacts folder were stored in a separate pst-file and thus fully recoverable.
In that case, you can try disabling the option “When displaying hierarchy in Outlook, show only subscribed folders.”Depending on the size of your hard disk or SSD in your computer, your Offline Settings might be set to only store up to 1 month, 3 months, 12 month worth of emails on your local disk.
If you’ve got enough space on your disk and want to cache more emails locally, you can set the sync slider in the following way: File- Outlook Data File (.pst)If you are still having issues then and want to roll back the update for now, you can do this via Control Panel when you are using the msi-installer or via a command line when you are using an Office 365 installation of Office 2013.
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Ost-file isn’t recoverable: possible loss of Calendar and Contacts Another important thing to keep in mind is that the ost-file of an IMAP account isn’t recoverable without using (expensive) 3rd party tools; You can’t reuse the ost-file when you recreate the account or move it to another computer!
This means that all the folders which have “This computer only” behind them will be lost if you do not export them.
When it comes to support with security updates and confirmed software bugs, no support charges will apply but you might need to supply credit card information to open the support case. Language issues If you are working with an IMAP server which is using names for special folders in a language other than your language of Outlook, these special folder might not be recognized in Outlook and local “This computer only” folders might be created.