Collaborative Inbox vs Shared Mailbox: Which One Does Your Team Need?

Google shared inbox comparison at a glance

In Gmail, Google’s own admin help treats shared inbox access as delegation. ^[4]

What each option actually is

Google Groups Collaborative Inbox: a Google Group with a shared address that lets permitted members take, assign, and track conversations as team work. ^{[8] [9]}

Google Workspace shared mailbox: usually a real Gmail account that several users access through delegation. In Gmail, Google’s own admin help treats shared inbox access as delegation. ^[4]

Setup, permissions, cost, limits, and the real trade-offs

1) Setup: how each option is created

2) Workflow: queue vs mailbox

Collaborative Inbox is built around work ownership. Members can take a conversation, assign it, and track its status, so the team sees who owns what. A Google Workspace shared mailbox shares access to one mailbox, but the mailbox itself is still the main object. ^{[8] [9] [4]}

If your team says “who owns this?” all day, that one difference should decide it: choose Collaborative Inbox.

3) Where the work happens: Google Groups vs Gmail

Collaborative Inbox lives in Google Groups, and Groups for Business must be enabled for those features to exist. A Google Workspace shared mailbox lives in Gmail through delegation. That usually means less retraining for teams already working in Gmail every day. ^{[7] [8] [4]}

This is why small admin and sales teams often lean toward delegation: it feels closer to the Gmail workflow they already know.

4) Permissions: who can do what

Collaborative Inbox permissions are role-based: owners and managers decide who can moderate metadata, moderate content, post, or manage members. ^[10] A Google Workspace shared mailbox is simpler but broader: delegates can read, send, and delete messages, admins can control whether the delegate’s address appears when they send from the mailbox, and delegation is limited to users in the same organization. ^{[3] [4]}

Pick Groups if you need tighter workflow roles. Pick delegation if you need shared access fast.

5) Cost and licensing

In practice, Collaborative Inbox is usually the cheaper native Google option for a team queue. Groups for Business is available across Google Workspace Business editions, so if the people working the queue already have accounts, you usually are not buying another mailbox just to create the shared address. Collaborative Inbox rides on that Groups setup. ^{[5] [7] [8]} A Google Workspace shared mailbox is different: aliases cannot be delegated, so the shared address normally needs its own mailbox account. Delegates themselves do not add a separate fee, but the extra mailbox seat usually does. Google’s billing and plan pricing vary by region, term, and promotions. ^{[4] [14] [6]}

If avoiding extra mailbox seats matters more than living in Gmail, Collaborative Inbox usually wins on cost.

6) Limits and scale

A delegated Gmail account supports up to 1,000 unique delegates, with Google recommending roughly 40 concurrent users for typical performance. Groups can have unlimited members. Small teams will never hit either limit, but delegation has the clearer ceiling when lots of people might jump into the same mailbox at once. ^{[3] [11]}

7) Ownership and retention

Collaborative Inbox is cleaner as a team-owned object. Google says the group keeps working if an owner leaves, and admins can reassign ownership. The catch is data: Google says group history stays until the group is deleted, so you should check that behavior against your retention plan before you roll it out. ^[11]

Risks and dealbreakers

Collaborative Inbox is a bad choice if: your team will not use Google Groups for the workflow, you need Gmail-first mailbox behavior, or you do not want long-lived group history that stays until the group is deleted. ^{[11] [7] [8]}

A Google Workspace shared mailbox is a bad choice if: you need native take/assign/status workflow, you want to avoid paying for a real mailbox account, or you expect delegates to get full account control or every Gmail feature. Mobile delegated access is also still something to test, not assume. ^{[8] [9] [4] [2] [3] [1]}

One non-option: do not solve this with a shared Gmail login . Google says Google Accounts are intended for use by only one person. If several people need the same address, use delegation or a Group instead. ^[15]

Switching path: how to change direction with minimal loss

These are different object types, so the safest move is a phased cutover, not a same-day replacement.

From Collaborative Inbox to a Google Workspace shared mailbox

1. Create the new mailbox first on a temporary address and add delegates.
2. Test sender display and mailbox rules before touching the public address.
3. Move the public address last, and keep the old Group alive as an archive until you are done with it.

That order protects history and gives delegation time to propagate. Google says group history remains until the group is deleted, and delegation changes can take up to 24 hours. ^{[11] [3]}

From a Google Workspace shared mailbox to Collaborative Inbox

1. Create the Group first and turn on Groups for Business if needed.
2. Enable Collaborative Inbox and conversation history, then pilot assignment with a small team.
3. Move the public address only after the workflow works, and keep the old mailbox read-only for a short overlap.

That order matters because Collaborative Inbox depends on Groups for Business, conversation history, and permissions being in place before the team can use assignment features. ^{[7] [8] [9]}

Clear pick: choose this if...

• If you need thread ownership, assignments, and status, choose Google Groups Collaborative Inbox . ^[8]
• If you need a real Gmail mailbox that a small team can share with minimal retraining, choose a Google Workspace shared mailbox . ^[4]
• If avoiding extra mailbox-seat cost is the top priority, start with Collaborative Inbox . ^{[5] [4] [14] [6]}
• If your team will not open Google Groups to run the queue, choose a shared mailbox . ^{[7] [8] [9]}
• If you do not want history living in a Group until the group is deleted, choose a shared mailbox ; if continuity of a team-owned queue matters more, choose Collaborative Inbox . ^[11]
• If mobile access is non-negotiable, test Gmail delegation on your real devices before you commit. If that passes, a shared mailbox is usually the better fit. ^{[1] [2]}

Frequently Asked Questions