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Illustrative comparison of one person receiving messages in a personal inbox and three coworkers using one shared team inbox.
An email alias can feed one person's mailbox; a shared mailbox gives authorized colleagues a common inbox. Illustrative scene, not a Microsoft product interface.

Business software

Shared mailbox or email alias? Choose who owns the next reply.

An address such as sales@yourbusiness.example can look the same to a customer while working very differently behind the scenes. In Microsoft 365, an alias can deliver another address into one person's mailbox. A shared mailbox gives authorized staff a common place to handle messages.

By Atlas Liaison Group · Sources checked November 2, 2026 · Documentation research

Shared mailbox vs email alias in Microsoft 365

QuestionAlias on one user's mailboxShared mailbox
Where does incoming mail go?To the existing user's mailbox.To the common mailbox authorized staff can access.
Who needs to manage it?A fit to examine when one person handles the address.A fit to examine when several staff need the same working inbox.
How are staff added or removed?Review the owning user's mailbox arrangement.An administrator manages the relevant delegated permissions.
Can staff reply as the business address?Check the platform's configured sending behavior.Assign and test the required sending permission as well as access.

This comparison is scoped to Microsoft's documented services. Other mail providers may use different names or offer different features, so confirm their equivalent before applying the same setup.

A small-team example

A sole operator receiving sales inquiries and doing all the replies may only need another address feeding the existing inbox. When a second person begins answering those inquiries, ask whether both people need to see the same history, coordinate follow-ups and respond under the business address.

A shared mailbox can supply that common inbox. It does not, by itself, assign every conversation to a staff member or guarantee that nobody replies twice. Agree on a simple process: who checks new mail, how a conversation is marked as being handled, and where the next action is recorded.

Access is not the same permission as sending

Microsoft separates Full Access from Send As and Send on Behalf. Being able to open and manage the mailbox does not automatically mean a person can send from it. If a new team member can read messages but cannot reply as the shared address, have the administrator inspect the intended permissions rather than sharing another employee's password.

Microsoft also says shared mailboxes are not intended for direct sign-in. Staff should use their own authorized accounts. Confirm subscription and licensing requirements for the intended features; “shared” is not a promise that every possible configuration is free.

Test the handoff before printing the address everywhere

  1. Send a test message from outside the business.
  2. Confirm the right staff can find it and see the shared history.
  3. Reply and inspect the address the outside recipient actually sees.
  4. Check where the sent reply is stored in the intended setup.
  5. Decide how unanswered and already-handled messages will be distinguished.
  6. Confirm the process for adding a colleague and removing access when responsibilities change.

If your real need is automatic assignment, response targets or a ticket history, compare that requirement with a help-desk workflow as well. Buying a larger software package before testing a real conversation can hide the simple problem: nobody knows who should reply next.

Explore business softwareDiscuss an email workflow

Related: Test business software with one real workflow.

Sources