Last wednesday, the 11th of October 2022, Microsoft released the KB5018410 update. After installing the update, Outlook that is connected to IMAP mailboxes started reporting error 0x800CCC0E.
The workaround is to uninstall the KB5018410 update:
- Go to the Control panel and search for update history.
- If KB5018410 is present as an installed update, click on Uninstall updates on top of the screen
- Find KB5018410 in the updates list, mark it and click on Uninstall above the list
- The uninstall will take several minutes and requires the computer to reboot
After uninstalling KB5018410 Outlook IMAP sync will start working again.