Microsoft on-premises server product that runs Office Online.
Hi @Chris DiBetta
Thank you for posting your question in the Microsoft Q&A forum.
To help narrow down the issue, could you please share a bit more detail:
-Which version of Outlook are you currently using (Classic Outlook or the New Outlook)?
-Which email providers do the two affected accounts use?
There is a known issue where some Gmail and Yahoo IMAP accounts stopped syncing in Classic Outlook starting February 26, 2026. If that matches your situation, you may want to try the workaround described in this article: Users get errors 0x800CCC0E & 0x800CCC0F synchronizing Gmail and Yahoo accounts in classic Outlook …
Please know that while our initial response might not resolve the issue right away, your input is incredibly valuable. With a bit more detail, we’ll work together to find the best solution for you.
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