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I use a desktop running Outlook 2016 on Windows 10. I have 2 IMAP accounts and 1 POP3 account configured. I store all emails in my IMAP accounts on the server until the end of each year. I also have an Android configured with these 3 accounts. Outlook 2016 hangs almost daily on the synchronizing step. It appears the problem is only with the IMAP accounts, but it can hang on any of the folders within the IMAP account. Does having too many connected accounts cause them to lock each other out leading to the sync error? Any suggestions? I've read a ton of posts on sync problems, but I cannot do anything except either wait several hours or end the Outlook task. The next time I start Outlook it starts up the sync again and doesn't finish.