Guide
Shared mailbox in Outlook: what it can do and where it fails in a team
The shared mailbox in Microsoft 365 is free, quickly set up and the starting point for many teams. As soon as three or more people work info@, the limits show. Here they are, and what you can do about them without giving up Outlook.
Updated: 8 October 2026
How the shared mailbox in Microsoft 365 works
A shared mailbox is a mailbox in Exchange Online that belongs to no user. The administrator creates it in the Microsoft 365 admin centre, adds members, and it shows up in everyone’s Outlook as a second mailbox. It needs no licence, has 50 GB of storage and its own address such as info@company.com.
Technically that is all. For the team the work only starts: Outlook shows everyone the same list but nobody who is taking care of it.
Eight limits of the shared Outlook mailbox in daily team work
- 1
No assignment
Outlook does not know “Mr Kaya is on it”. Categories and flags are personal or have to be maintained manually by everyone.
- 2
No status per conversation
Read is not done. Whether an email was answered only shows if you search the Sent folder for the reply.
- 3
No internal notes
Coordination runs via forwards, Teams chats or shouting across the office. None of it is attached to the email.
- 4
No double-reply warning
Two colleagues open the same email and both reply. The customer gets two different answers.
- 5
No reporting
How fast does the team reply? How many emails are open? Outlook cannot tell.
- 6
No snooze for the team
Follow-up in Outlook is personal. A reminder the whole team sees does not exist.
- 7
No customer context
Order, calls and older cases of the customer live in other programs.
- 8
Technical limits
Microsoft recommends at most 25 concurrent users per shared mailbox, storage 50 GB without an archive licence.
The usual workarounds and why they do not hold
- Categories as assignment: only works if everyone is disciplined, and does not show whether the email is done.
- Subfolders per colleague: emails get moved back and forth, the conversation falls apart, searching becomes tedious.
- Forwarding to the personal mailbox: the case disappears from the team mailbox, the reply comes from the wrong sender.
- Spreadsheet or Planner on the side: two systems, double maintenance, outdated after two weeks.
The fix: keep Outlook, add collaboration
Teamox does not replace the shared mailbox, it adds a collaboration layer on top. Emails stay in Exchange Online, Outlook remains usable. Teamox adds what Outlook lacks and shows everything inside Microsoft Teams:
Assign and status
Ownership and open/done on every conversation, visible to everyone.
Internal notes
Coordination on the email with @-mentions. The customer sees nothing.
Collision detection
Shows when a colleague has the same email open or is typing.
Real Outlook folders
Folders and archive stay in sync. Resolving archives in Outlook too.
Snooze and reminders
For the whole team, with notifications in Microsoft Teams.
Reporting
Response times, open emails per team, volume per week.
Background: What is a shared inbox? · How Teamox is set up · Pricing from €19.99 per user
Frequently asked questions about shared mailboxes
What is a shared mailbox in Outlook?
How do I create a shared mailbox in Microsoft 365?
Can you see in Outlook who is handling an email in the shared mailbox?
Do I have to change the shared mailbox for Teamox?
Is a shared Outlook mailbox enough for a small team?
Keep Outlook. Add the team.
Teamox puts assignment, status and notes on top of your shared mailbox. Inside Microsoft Teams, set up in an hour.