When users observe discrepancies, they should understand that their Outlook mailbox is experiencing synchronization issues. Often some emails get stuck in Outlook and users face gaps in the messages. This synchronization between OST files and the mailbox is responsible for maintaining a smooth and uninterrupted email communication system. To manage its data well, it stores all the user’s mailbox data for offline work it saves data in an OST file -Offline Storage Folder.Īny changes in the mailbox that the user makes are saved offline in OST files and then updated in the mailbox server by synchronization. Thanks for the help.Microsoft Outlook has become email users’ favorite personal data managing application due to the variety of services and facilities it offers. The next time I go in it just starts up the sync again. When it hangs, I cannot do anything except either wait (currently 3 hours) or end the Outlook task. Any suggestions? I've read a ton of posts on sync problems, but none seem to be related to sync-ing when IMAP accounts are involved. I ran SCANPOST on all 3 files, which did correct some errors, but that did not solve the problem.

I am ASSUMING that Outlook on my PC is trying to sync with the server, which is in turn trying to coordinate the sync between the PC and the phone. It appears to be only in the IMAP accounts, but it can hang on any of the folders within the IMAP account. Outlook 2016 hangs pretty much every day on the synchronizing step. I also have an Android phone that attaches to these 3 accounts.

Each new year, I offload the previous year's IMAP mail as well as start a fresh POP3 data file, so that I have 'minimal' emails on the server.

I I leave all the messages in my IMAP accounts on the server until the end of the year. I have 3 accounts attached: 2 IMAP accounts and 1 POP3. I use a desktop running Outlook 2016 (32) on Windows 10 (64) Pro.

Outlook 2016 sync issues fix