Outlook Mobile cannot send meeting‑related email. Normal email sends fine. RSVP acceptance does nothing.

Question

Outlook Mobile cannot send meeting‑related email. Normal email sends fine. RSVP acceptance does nothing. I’ve already removed ActiveSync, reset Outlook Mobile, cleared calendar storage, and tested with a new calendar. I need a mailbox‑level calendar permissions reset.”

Answer 1

Thanks so much for providing these instructions. I opened Outlook.com and I cannot find a mobile device option under the General Tab, nor can I find that option in the browser version of Outlook.com based upon the instructions you explained in step 1.

Thank you.

Answer 2

Dear @Richard Walker,

I understand that normal email works fine in Outlook Mobile, but meeting‑related emails (RSVPs, acceptance, etc.) are not sending. Since you’ve already tried removing ActiveSync, resetting Outlook Mobile, clearing calendar storage, and testing with a new calendar, the next step is to check mailbox‑level calendar permissions.

In Microsoft 365, calendar permissions are managed at the mailbox level. I recommend resetting them using Outlook on the web or PowerShell:

• In Outlook on the web, right‑click your calendar > Sharing and permissions > remove existing permissions and re‑add them. Please refer to this document: Share and access a calendar with edit or delegate permissions in Outlook
• If you have admin rights, you can use PowerShell with the Remove-MailboxFolderPermission and Add-MailboxFolderPermission cmdlets to reset permissions. Official documentation: Manage permissions for recipients. Please refer to this document: Set-MailboxFolderPermission

If the issue persists after resetting permissions, please confirm whether the problem occurs only on Outlook Mobile or also on Outlook desktop/web. This helps determine if it’s a client‑specific issue or a mailbox configuration issue.

I’ll continue to support you until this is resolved.

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