info@ and support@ without a paid seat: shared mailboxes in Microsoft 365 and Google Workspace for a ten-person business

Every small business needs department email addresses on day one. You need info@yourcompany.com on your website contact form, support@yourcompany.com for customer questions, and invoices@yourcompany.com or billing@yourcompany.com for incoming vendor receipts and supplier correspondence.

The default reaction of many office managers is to open their admin dashboard and click "Add User". On Google Workspace, that adds another $6, $12, or $18 every month. On Microsoft 365, it adds $6, $12.50, or $22 every month. For three department addresses across a ten-person company, paying for dedicated user seats wastes $216 to $648 every year—simply to hold messages that two or three existing team members read.

Both platforms provide zero-license ways to handle departmental email, but they work on completely different technical architectures. Microsoft 365 gives you dedicated, full-featured shared mailboxes at zero cost up to 50 GB. Google Workspace has no native free mailbox; instead, it relies on Google Groups Collaborative Inboxes or paid delegation.

This guide breaks down the yearly costs, setup steps, mobile app limitations, licensing compliance rules, and the exact volume threshold where shared inboxes break down and require a dedicated ticketing tool.

The yearly cost comparison: three shared addresses for ten people

Here is what a ten-person company actually pays annually to run info@, support@, and invoices@ depending on how they configure the mailboxes across Google Workspace and Microsoft 365:

| Setup method | Base platform tier | Cost per shared address | 3 addresses / year | Key constraint |
|---|---|---|---|---|
| Microsoft 365: Shared Mailbox | Business Basic ($6/user/mo) | $0.00 | $0.00 | 50 GB storage ceiling; direct user login blocked |
| Microsoft 365: Dedicated Seats | Business Basic ($6/user/mo) | $6.00 / mo | $216.00 / yr | Wasted spend; provides unused OneDrive & Apps |
| Microsoft 365: Dedicated Seats | Business Standard ($12.50/user/mo) | $12.50 / mo | $450.00 / yr | Wasted spend for simple mail routing |
| Google Workspace: Google Groups | Business Starter ($6/user/mo) | $0.00 | $0.00 | Separate groups.google.com interface; basic collisions |
| Google Workspace: Delegated Mailbox | Business Starter ($6/user/mo) | $6.00 / mo | $216.00 / yr | Requires 1 paid user seat per delegated address |
| Google Workspace: Delegated Mailbox | Business Standard ($12/user/mo) | $12.00 / mo | $432.00 / yr | Full Gmail web interface, but no native mobile app |
| Google Workspace: Email Alias | Any tier | $0.00 | $0.00 | 1-to-1 only: cannot route to multiple staff members |

If your team uses Microsoft 365, you can run all three addresses completely free forever without licensing violations. If you run Google Workspace, you must decide between the zero-cost Collaborative Inbox inside Google Groups or paying $216 to $432 annually for dedicated delegated Gmail accounts. (For full tier pricing and platform comparisons, see our breakdown of Google Workspace or Microsoft 365 for a ten-person business).

Microsoft 365 shared mailboxes: How the free model works

In Exchange Online, a Shared Mailbox is a genuine mailbox with its own inbox, sent items, draft folder, custom subfolders, and calendar. It does not consume a license because its direct user account has sign-in permanently disabled.

Licensed employees access the mailbox through assigned Exchange permissions. The setup takes under three minutes in the Microsoft 365 Admin Center:

- 1. Create the mailbox: Go to Teams & groups > Shared mailboxes > Add a shared mailbox. Enter Name (Customer Support) and Email (support@yourcompany.com).
- 2. Assign member permissions: Under Members, click Edit next to Members who can read and manage (Full Access) and add your support staff. Next to Send as permissions, add the employees allowed to reply directly from support@yourcompany.com.
- 3. Automatic mapping: Exchange automatically adds the shared mailbox to each member's Outlook Desktop application and Outlook Web App (OWA) sidebar within 30 minutes via Exchange Autodiscover.

### The Sent Items trap in Microsoft 365

By default in older Exchange configurations, when Alice replied to an email from support@yourcompany.com, Outlook placed a copy of her outgoing reply only into Alice's personal Sent Items folder. Bob, also working the support queue, could not see that Alice had already replied.

You can resolve this immediately in the Microsoft 365 Admin Center: click the shared mailbox, select Sent items, and check both: Copy items sent as this mailbox and Copy items sent on behalf of this mailbox. Alternatively, an admin can run this Exchange Online PowerShell command for all departmental inboxes:

Once enabled, every reply sent by any team member appears inside the shared mailbox's Sent Items folder in real time, preventing duplicate replies.

### Mobile app access on iOS and Android

A common myth is that Microsoft shared mailboxes cannot be accessed on smartphones. They work natively in the official Outlook mobile app on iOS and Android without consuming a device license:

- 1. Open the Outlook mobile app on your phone.
- 2. Tap your profile icon in the top left corner, then tap the mail icon with a plus sign (Add Mailbox).
- 3. Select Add a Shared Mailbox from the bottom menu.
- 4. Select your primary personal licensed account, type support@yourcompany.com, and tap Add.

The shared mailbox appears as a distinct account in the Outlook sidebar, complete with push notifications, search, and the ability to send replies directly as support@.

Google Workspace: Collaborative Inboxes vs Delegated Mailboxes

Google Workspace does not offer an unlicensed mailbox object. If you do not want to purchase an additional user seat, you have two native options and one alias option:

### Option A: Google Groups Collaborative Inbox ($0 / year)

A Collaborative Inbox is a Google Group configured with workflow metadata (assignments, status, resolution flags). It costs $0 and supports unlimited group members:

- 1. Create the Group: In Google Admin Console, go to Directory > Groups > Create group. Name it Info Inquiries with email info@yourcompany.com. Set Access type to Custom and ensure External: Anyone on the web can post is checked, or outside customers will get bounce emails.
- 2. Enable Collaborative Inbox: Visit groups.google.com, open the group settings, and turn on Enable Collaborative Inbox features.
- 3. Configure Send As: Each staff member opens their individual Gmail settings > Accounts > Send mail as > Add another email address. They enter info@yourcompany.com, uncheck "Treat as an alias", and complete the verification code sent to the group.

The downside: The collaborative features (assigning a conversation to a teammate, marking "Complete", filtering by owner) only exist inside the groups.google.com web portal. In standard Gmail, incoming group emails simply land in everyone's personal inboxes. If Alice archives or labels it in her personal Gmail, Bob still sees it unread in his. (To ensure group emails pass DMARC and avoid spoofing flags, verify your records against our SPF, DKIM, and DMARC configuration guide).

### Option B: Gmail Delegation ($72 to $216 / address / year)

If your team insists on working inside the real Gmail interface with shared labels, filters, drafts, and read/unread synchronization, you must buy a dedicated user license for that address, then turn on Gmail Delegation:

- 1. Purchase the account: Create a paid user named Support Desk with address support@yourcompany.com.
- 2. Grant access: Sign into that account, open Gmail Settings > Accounts > Grant access to your account, and add the email addresses of your team members.
- 3. Switch accounts: Team members click their Google profile circle in Gmail and select the delegated support@ mailbox. It opens in a dedicated browser tab.

The downside: Beyond the $72 to $216 annual license fee, delegated Gmail accounts do not work in the Gmail mobile app on iOS or Android. Employees working on mobile devices cannot switch into delegated accounts without logging into a mobile web browser.

### Option C: Email Aliases ($0, but strictly 1-to-1)

Google allows up to 30 free aliases per user. You can add billing@yourcompany.com as an alias on the founder's account. However, an alias can belong to only one user. You cannot attach an alias to two people. The moment a second person needs to review billing questions, the alias must be deleted and converted into a Group.

Feature matrix: Microsoft shared mailbox vs Google Collaborative Inbox

Before choosing which platform to standardize on for customer inquiries, compare their technical capabilities side by side:

| Operational feature | Microsoft 365 Shared Mailbox | Google Groups Collaborative Inbox | Google Workspace Delegated Mailbox |
|---|---|---|---|
| License cost | $0.00 | $0.00 | $6.00 to $18.00 / month |
| Storage capacity | 50 GB free (expandable to 100 GB) | Unlimited group storage | 30 GB to 2 TB (depends on user tier) |
| Native mobile app | Yes (Outlook iOS & Android) | No (email delivery to personal app) | No (web browser only on mobile) |
| Read / Unread sync | Yes (shared state across team) | No (individual to each member's inbox) | Yes (shared state across team) |
| Folder / Label sync | Yes (Outlook folder hierarchy) | Yes (tags inside groups portal only) | Yes (Gmail labels & filters) |
| Collision prevention | None (requires visual communication) | Built-in (assignee & status flags) | None (unless draft indicator seen) |
| Send As alignment | Aligns with custom domain DKIM | Aligns with custom domain DKIM | Aligns with custom domain DKIM |
| Audit log tracking | Exchange admin audit log | Group audit logs | Admin Console audit log |

Licensing traps: What will get your account flagged or blocked

Running free mailboxes requires strict adherence to terms of service. Small companies frequently commit three compliance errors that trigger account lockouts or forced billing back-charges:

### 1. Direct login to a Microsoft shared mailbox

Microsoft Product Terms explicitly state: "Shared mailboxes may not be used by users without a license, nor may they be used directly via basic authentication or interactive sign-in." If an administrator resets the password on a shared mailbox and gives that username/password to a contractor or part-time assistant to log in directly via outlook.office.com, that is a licensing breach. Microsoft Entra ID monitors interactive sign-ins on unlicensed mailboxes; detect continuous interactive logins, and Microsoft will flag the tenant for non-compliance.

### 2. The 50 GB ceiling and archiving rules

An unlicensed Microsoft shared mailbox caps at exactly 50 GB. When it reaches 50.01 GB, Exchange stops accepting incoming emails and bounces messages with error code 554 5.2.2 mailbox full. Furthermore, you cannot enable In-Place Archiving or Litigation Hold on an unlicensed shared mailbox. If your legal counsel requires retention holds or you cross 50 GB, you must assign an Exchange Online Plan 2 license ($8.00/user/month) or an Exchange Online Archiving add-on ($3.00/user/month).

### 3. SMTP relay for scanners, printers, and web apps

Small companies often try to use support@yourcompany.com or info@ as the authenticated SMTP sender for website contact forms, billing scripts, or office copiers. Because shared mailboxes have sign-in blocked and multi-factor authentication (MFA) defaults enforced, attempting basic SMTP AUTH against an unlicensed shared mailbox will fail (535 5.7.139 Authentication unsuccessful). For transactional app sending or scanner relays, use dedicated transactional mail APIs or an authenticated licensed utility account.

The worked department setup for a ten-person company

To organize your company cleanly without spending an extra dollar on licenses, implement this three-part architecture:

### 1. info@yourcompany.com (General Inquiries)

- Volume: Low (3 to 10 incoming emails per day).
- Primary handlers: Office manager and executive assistant, with the founder having read access.
- Implementation:
- On M365: Shared mailbox. Assign Read & Manage and Send As permissions to the two handlers. Folder structure: Inbox, Forwarded to Sales, Handled, Spam.
- On Google: Google Group with Collaborative Inbox. Set posting permission to Public. Members check the group once in the morning and once in the afternoon.

### 2. invoices@yourcompany.com (Billing & Accounts Payable)

- Volume: Moderate (5 to 15 bills, vendor receipts, and subscription notices per week).
- Primary handlers: Founder and external accountant / bookkeeper.
- Implementation:
- On M365: Shared mailbox. Create subfolders: 1-Pending-Approval, 2-Approved-for-Payment, 3-Paid-and-Reconciled. When the accountant processes a receipt, they drag the email into 3-Paid-and-Reconciled. No invoices get lost or paid twice.
- On Google: Google Group routing to the founder and accountant. (For proper routing of vendor renewal notices and failed-payment warnings, read our guide on who gets the invoice and renewal notices at a small SaaS).

### 3. support@yourcompany.com (Customer Support Queue)

- Volume: Variable (10 to 25 tickets per day across ten staff members).
- Primary handlers: Two support engineers and one product specialist.
- Implementation:
- On M365: Shared mailbox with categorised colour tags (Urgent - Bug, Onboarding, Feature Request). Ensure MessageCopyForSentAsEnabled is turned on so everyone sees replies.
- On Google: Collaborative Inbox inside Google Groups. Every incoming ticket must be assigned to a specific person before replying, or two engineers will respond simultaneously with different answers.

When is a dedicated helpdesk tool worth paying for?

A free shared mailbox works well up to a specific operational ceiling. How do you know when your company has outgrown free email routing and needs a dedicated support platform like Help Scout, Front, or Zendesk?

### The four tipping points

- 1. Collision waste (Two people answering the same email): When two team members spend 15 minutes drafting detailed technical responses to the same customer and hit send simultaneously, it looks unprofessional and wastes payroll.
- 2. The lost ticket problem: In a shared mailbox, if someone accidentally clicks "Mark as Read" or moves an email to a personal folder, the ticket disappears from sight. There are no Service Level Agreement (SLA) timers or escalation alerts.
- 3. No analytics on response times: You cannot measure your First Response Time (FRT) or resolution speed in Outlook or Gmail without manual spreadsheets.
- 4. Internal collaboration notes: Team members cannot chat privately inside an email thread before replying without forward-chain clutter.

### Cost comparison of dedicated tools

When you cross 25 customer inquiries per day or have more than three people actively answering support, the cost of dedicated ticketing software easily pays for itself by reducing churn:

| Tool | Target audience | Base price per user | Monthly cost for 3 support staff | Standout capability |
|---|---|---|---|---|
| Help Scout (Standard) | Small businesses & SaaS | $22 / user / mo | $66 / month | Excellent shared inbox feel; collision detection; customer history |
| Front (Starter) | Small teams | $19 / user / mo | $57 / month | Handles email, SMS, and WhatsApp in one multi-channel inbox |
| Missive (Productive) | High-collaboration teams | $18 / user / mo | $54 / month | Real-time internal team chat directly alongside email drafts |
| Zendesk (Suite Team) | Complex enterprise workflows | $55 / agent / mo | $165 / month | Deep ticketing logic, macros, triggers, and multichannel routing |

### The bottom line rule

If your ten-person company handles fewer than 20 customer emails a day, do not pay for a helpdesk and do not pay for extra mailbox seats. Use Microsoft 365 Shared Mailboxes or Google Groups Collaborative Inboxes with clear internal folder habits. When support volume permanently exceeds 25 emails a day, invest $54 to $66 a month in a lightweight shared inbox tool like Missive or Help Scout rather than buying expensive user seats in your primary office suite.