Need a support@ or sales@ inbox several people share, without buying a whole seat for it? On this one requirement, the two big suites split hard.
Most Google Workspace versus Microsoft 365 comparisons fight over storage and apps. But if your actual need is narrow, a shared team inbox that several people work from without paying for an extra user, the two suites answer very differently. Microsoft built a feature for exactly this. Google leaves you choosing between a free workaround with real gaps and a paid seat. Knowing which is which saves you either a monthly bill or a month of frustration.
In Brief
If a true shared mailbox at no extra license cost is the requirement, Microsoft 365 wins clearly: it offers a purpose-built shared mailbox with up to 50 GB of storage and no license attached. Google Workspace’s free option, a Collaborative Inbox built on Google Groups, works for a small, low-volume team but is not a real mailbox, and a proper shared Gmail inbox means paying for a seat or adding a third-party tool.
The short verdict
For this specific job, Microsoft 365 is the better fit, because a shared mailbox is a native, free object in the system rather than a workaround. Google can absolutely run a shared team inbox too, and its free version is fine for a couple of people handling light email, but it comes with compromises that grow painful as volume rises. Pick based on how real your shared-inbox needs are.
Microsoft 365: the free shared mailbox
Microsoft 365 lets you create a shared mailbox that holds up to 50 GB without any license assigned to it. You create it in the admin center, add the team members who should access it, and they see it alongside their own mailbox in Outlook. Replies go out from the shared address, everyone works the same inbox, and it costs nothing extra.
The catch is small and worth stating plainly: each person who accesses the shared mailbox still needs their own Microsoft 365 license, and the mailbox itself needs a license only in specific cases, if it exceeds 50 GB, or you want archiving, litigation hold, or the ability to sign in to it directly. For a normal support or sales inbox, none of that applies, so it stays free.
Google Workspace: a workaround or a paid seat
Google has no direct equivalent to the free shared mailbox. Its no-cost option is a Collaborative Inbox built on Google Groups, which does not consume a user license because a group address is not a user account. Members manage shared conversations, assign them, and mark them resolved.
It works, but know what you are giving up. In a Collaborative Inbox, replies go out from members’ personal addresses unless you configure send-as, there is no collision detection to stop two people answering the same message, no internal notes on a thread, and no real mobile app, since conversations show up only in a mobile browser. It suits a team of roughly two to five people with low email volume. For a genuine shared Gmail inbox with the shared address, collision detection, and mobile access, you either license a dedicated user account as the mailbox or add a third-party tool like Hiver or Front on top of Gmail.
Side by side
| Feature | Microsoft 365 shared mailbox | Google Collaborative Inbox |
|---|---|---|
| Extra license needed | No, up to 50 GB | No, but it is not a full mailbox |
| Replies from the shared address | Yes, by default | Only if you configure send-as |
| Collision detection | Limited, via Outlook | No |
| Mobile access | Yes, in Outlook | Mobile browser only |
| Best for | Real shared inboxes, any size | Small, low-volume teams |
Which should you choose
Choose Microsoft 365 if a shared inbox is a core part of how your team works, if the volume is more than a trickle, or if you are already an Outlook shop, because the free 50 GB shared mailbox does the job without add-ons. Choose Google’s Collaborative Inbox if you are a small team already on Workspace, your shared email is light, and you can live without collision detection and a proper mobile app. And if you need a real shared Gmail inbox with those missing features, budget for either a dedicated seat or a tool like Hiver, rather than forcing the free workaround to be something it is not.
Frequently Asked Questions
Does a Microsoft 365 shared mailbox need a license?
Not by default. It is free up to 50 GB. You only need a license if it exceeds that, or you want archiving, litigation hold, or direct sign-in. The people accessing it still need their own licenses.
Does Google Workspace have a free shared mailbox?
Not a true one. Its free option is a Collaborative Inbox on Google Groups, which does not use a license but lacks features of a real mailbox. A dedicated shared Gmail inbox typically needs a paid seat or a third-party tool.
Why do Collaborative Inbox replies come from a personal address?
Because the group is not a mailbox, so by default members reply as themselves. You can set up send-as so replies appear from the shared address, but it is an extra configuration step, not the default.
Which is better for a support or sales inbox?
Microsoft 365, in most cases, because its shared mailbox is purpose-built, free, and sends from the shared address out of the box. Google’s free option fits only small, low-volume teams comfortably.
Can I get collision detection on Gmail?
Not in a plain Collaborative Inbox. You would add a third-party shared-inbox tool such as Hiver, Front, or Missive on top of Gmail, which brings collision detection, notes, and mobile access for a per-user cost.
Do users still need licenses either way?
Yes. In both suites, the individual people working the inbox need their own paid accounts. What varies is whether the shared inbox itself costs extra, and in Microsoft 365 it generally does not.
Final Word
This is one of the rare suite comparisons with a clean answer. If your requirement is a shared team inbox without an extra license, Microsoft 365’s free shared mailbox is the straightforward win, while Google’s free Collaborative Inbox is a reasonable fit only for small, light-volume teams that can accept its gaps. Decide based on how central the shared inbox is to your work, and do not pay for what one suite gives away. For a related account topic, see what an unrequested password reset email means, and browse more in ShoutPost’s Business section.