Shared Mailboxes in Microsoft 365: When They Make Sense and When They Do Not
Almost every small business has an address like info@ or billing@ that several people need to watch. The common shortcut is to give everyone the password to one account. It works for about a week, and then someone leaves and the password has to change, or two people reply to the same customer. Microsoft 365 offers better tools for this, including shared mailboxes, but you need to pick the right one.
The three options in plain terms
- Regular mailbox: belongs to one person (or one role) and usually has its own sign-in and license.
- Shared mailbox: a mailbox that several people open from their own accounts. Nobody signs in to it directly.
- Distribution group: not a mailbox at all. It is an address that forwards each incoming message to a list of people.
Licensing rules can vary by plan and change over time, so check your current plan before deciding. Generally, shared mailboxes are designed to avoid needing a full license for each one, with some exceptions such as when storage needs grow large.
When shared mailboxes make sense
A shared mailbox fits when several people need to read and reply to the same incoming messages, and you want a shared history.
- Customer-facing addresses such as info@ or support@
- Scheduling or intake addresses watched by a front desk team
- Billing or accounts-payable inboxes that more than one person handles
The big advantages are that replies can go out as the shared address, everyone sees what has been handled, and when someone leaves, you simply remove their access. There is no password to pass around.
When a distribution group is the better fit
If people only need to be informed, not to manage a conversation, a distribution group is simpler. An address like staff@ that sends announcements to everyone is a good example. Each person receives the message in their own inbox and handles it there. The downside is that there is no shared record: if three people receive a message, you cannot easily tell whether anyone replied.
When a regular mailbox is the right call
Some addresses really belong to one person or one role that needs its own identity. If someone needs to sign in to Teams, use a phone app, or hold documents under their own account, a regular licensed mailbox is the right choice. A shared mailbox generally cannot be used for direct sign-in, so it is not suited to a person who needs a full account.
Common mistakes to avoid
- Sharing a password to a regular mailbox. It removes accountability and makes security controls like multi-factor authentication awkward.
- Using a distribution group for a customer inbox. Nobody can see what has been answered.
- Forgetting permissions. A shared mailbox needs people added with the right permission, and typically a separate permission to send as the shared address.
- Leaving it unowned. Decide who is responsible for watching it, especially on busy days and vacations.
- Never reviewing access. When roles change, update who can open each shared mailbox.
Set clear habits around it
Technology only solves half the problem. Agree on simple team rules: who claims a message, how you mark something as handled (a category or a folder works), and how you avoid replying twice. Even a short written note of these rules helps new employees step in quickly.
It also helps to document each shared mailbox in one place. Write down its purpose, who has access, and who owns it. When someone leaves or changes roles, that list becomes your checklist. Without it, access tends to linger for years, and the person who set it up may no longer remember why a particular coworker was added. A few lines in a shared document are enough.
Where to start
List every shared address your business uses and write beside each one who needs to read it, who needs to reply, and who simply needs to know. That list tells you which option fits. If any of these addresses are currently run through a shared password, replace that setup first, because it is the biggest risk.
If you want help setting this up cleanly, Zippie IT supports Microsoft 365 for small businesses, including email, users and licenses, and security. See our Microsoft 365 support. Call (208) 810-1795 or email info@zippieit.com.
