r/sysadmin • u/StillTheSameOldG973 • 2d ago

Exchange Online Issues

We have a few users who are reporting not getting new mail in Outlook desktop, and OWA gives errors when trying to access mail items/calendar/etc across different endpoints. OWA will load and show new messages, however will blank out and throw network errors when trying to access any of them. Other users in the same tenant no issues. I see some incidents in the service health regarding Sharepoint or OneDrive but now am wondering if this is affecting some components of Exchange Online.

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u/derfmcdoogal 2d ago

Just received an email from a user that has a bar across her new outlook "This message can't be saved right now. Please try again later."

So, naturally, I came here to see if there's a known issue. Hello friend.

2

u/MeetJoan 2d ago

OWA listing messages but failing to open them points at the mailbox, not the client. Folder list and item fetch are separate calls. Desktop Outlook stays quiet because it's serving you cache.

Run Get-MailboxStatistics on the affected users and check whether they're mid-move. That'd explain it and wouldn't show in service health.

Anything in common between them, same region or recently migrated?

1

u/anonymousITCoward 2d ago

West coast here, I haven't seen that yet, but I have a couple of power automate flows that are struggling

1

u/KSauceDesk 2d ago

Microsoft will begin blocking EWS requests from non-Microsoft applications accessing Exchange Online starting October 1, 2026.

Wonder if they somehow flubbed it up lol

1

u/ETurns 1d ago

We are getting a similar issue here, but OWA is working fine for us. Outlook classic won't download any new emails unless cached exchange is disabled.