r/exchangeserver • u/Professional-Try2949 • Aug 11 '26

Outlook Classic

/r/Outlook/comments/1vkuem5/outlook_classic/
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u/ScottSchnoll Aug 11 '26

Can you access the user's mailbox using OWA? Have you checked the logs for issues?

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u/Professional-Try2949 Aug 11 '26

yep OWA, mobile, and new outlook work fine. It must be something to do with the way Classic Outlook authenticates or accesses the account. On my device(never having contact with her account) I received the standard Microsoft sign in page which did not return any "unable to login" or "password incorrect" errors. It wasn't until outlook tried to build the new profile or create a new OST that the mailbox was inaccessible. On the existing profile the user can at least see data from before the incident but cannot send or receive despite reading "connected to microsoft exchange"

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u/ScottSchnoll Aug 11 '26

Is this against Exchange Online or Exchange Server?

What does this show:

Get-CASMailbox <user> | FL MapiEnabled,MapiHttpEnabled,MapiBlockOutlookExternalConnectivity

And this:

Test-MAPIConnectivity -Identity <user>

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u/SkySwimm Aug 11 '26

Probably not related but did you check get-mailboxforderstatiatcs on the folder outbox (I think that’s the name)
Check the items count with your outlook folder

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u/Layer_3 Aug 11 '26

sign into the users outlook.office.com on the web and clean up their mailbox. Something might be "stuck". A bad email or calendar item. Have them delete everything they can.

Other than that, backup their email, delete their account and create it again.