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📬 Shared Mailbox Not Showing in Outlook? Check These 3 Things First

#itsupport #microsoft365 #outlook #beginners

"I was given access to the shared mailbox… so where is it?" 🤔

If you work help desk, you'll hear this one a lot. Someone gets added to a shared mailbox, opens Outlook, and nothing shows up. The tempting move is to remove the permission and add it again. Don't jump there yet. Most of the time it's one of three simple things.

⏳ 1. Give it time (and a real restart)

Permission changes in Exchange Online aren't always instant. It can take up to about an hour before the shared mailbox appears for the user.

Have them:

  • Fully close Outlook (check the system tray so it's really closed).
  • Reopen it and give it a minute to sync.

If the access was granted five minutes ago, this alone often fixes it.

🔍 2. Verify the permission actually exists

Don't assume the access was granted correctly. Check it. Connect to Exchange Online PowerShell and run:

Connect-ExchangeOnline
Get-MailboxPermission -Identity shared@company.com
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Look for the user in the list with FullAccess. If they're not there, you've found your problem: the access was never granted (or was granted to the wrong mailbox).

If an admin needs to grant it:

Add-MailboxPermission -Identity shared@company.com -User user@company.com -AccessRights FullAccess -AutoMapping $true
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With -AutoMapping $true, Outlook for Windows should add the mailbox automatically after it syncs.

💡 Heads up: if the user was given access through a security group, the mailbox won't auto-map. They'll need to add it manually (see step 3).

🌐 3. Add it manually or test in Outlook on the web

Still nothing? Add it by hand in classic Outlook:

  1. File > Account Settings > Account Settings
  2. Select the account > Change > More Settings
  3. Advanced tab > Add, then type the shared mailbox name

Want a fast way to prove the permission works? Use Outlook on the web:

  1. Sign in at outlook.office.com
  2. Click your profile picture (top right) > Open another mailbox
  3. Type the shared mailbox address

If it opens in the browser, the permission is fine and the issue is on the Outlook client side, like the profile or cache, not access.

✅ Quick recap

  • ⏳ Wait up to about an hour and restart Outlook.
  • 🔍 Confirm FullAccess with Get-MailboxPermission.
  • 🌐 Add it manually, or test with "Open another mailbox" in Outlook on the web.

Checking these first saves you from re-doing permissions that were already fine.

What's your go-to fix when a shared mailbox goes missing? Drop it in the comments 👇

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