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To send a Microsoft 365 meeting invitation from a shared mailbox, you need two separate permissions: Full Access to open and manage its calendar, and Send As or Send on Behalf to send using that mailbox identity. For an invitation that appears to come directly from the shared mailbox, use Send As; Send on Behalf shows the delegate’s name as well.
What the permissions mean
| Permission | What it allows | Required for sending? |
|---|---|---|
| Full Access | Open the mailbox, read messages, and create or manage calendar items | No |
| Send As | Send mail and meeting invitations that appear to come directly from the shared mailbox | Yes, for a direct mailbox identity |
| Send on Behalf | Send invitations showing the delegate’s name on behalf of the mailbox | Yes, if that attribution is acceptable |
These permissions are independent. A user can have Full Access without being able to send as the mailbox, or have sending permission without being able to manage its calendar.
Step 1: Create the shared mailbox, if necessary
An administrator can create the mailbox in the current Exchange admin center (EAC):
- Open the Exchange admin center.
- Go to Recipients > Mailboxes.
- Select Add a shared mailbox.
- Enter the display name and email address.
- Select Save.
Do not have users sign in directly with the shared mailbox account. Shared mailboxes are intended to be accessed through each user’s own Microsoft 365 account, and the shared-mailbox account should normally remain disabled.
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Step 2: Grant Full Access and Send As
For the usual setup—users manage the shared calendar and invitations appear to come directly from it—grant both permissions in the EAC:
- Go to Recipients > Shared.
- Select the shared mailbox and choose Edit.
- Open Mailbox delegation.
- Under Full Access, select Add, choose the users, and confirm.
- Under Send As, select Add, choose the same users, and confirm.
- Select Save.
Allow several minutes for a new membership or permission assignment to propagate. The user should then close and restart Outlook before testing.
Alternative: grant Send on Behalf
Send on Behalf is different from Send As. Recipients see the delegate’s identity as well as the shared mailbox—for example, “Alex on behalf of Support.”
For Microsoft 365, Microsoft documents assigning Send on Behalf through the Microsoft 365 admin center. The Exchange Server EAC has different capabilities, so instructions claiming that Send on Behalf can never be managed through an admin center are not universally current.
Exchange PowerShell can also assign the permission:
Set-Mailbox -Identity <MailboxOrGroupIdentity> -GrantSendOnBehalfTo <Delegates>
Example:
Set-Mailbox -Identity seanc@contoso.com -GrantSendOnBehalfTo hollyh
Use either Send As or Send on Behalf according to the identity you want recipients to see. Do not assume that adding Send on Behalf will fix a Send As permission problem.
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Step 3: Open the shared mailbox in New Outlook for Windows
After the administrator adds you as a member, restart New Outlook. The mailbox and its calendar should normally appear automatically.
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If they do not:
- Go to Mail.
- In the Folder pane, right-click your account name.
- Select Add shared folder or mailbox.
- Enter the shared mailbox name or email address.
- Select the matching mailbox.
To locate the calendar, expand Shared with me in the left Folder pane, select the shared mailbox, and open its calendar. After membership has propagated and Outlook has restarted, Microsoft says the shared calendar is automatically added to the Calendars list.
Step 4: Create and send the invitation in New Outlook
- Open Calendar.
- Select the shared mailbox calendar rather than your personal calendar.
- Select New event.
- Enter the subject, attendees, date, time, location, and any meeting details.
- Check the organizer or From identity before sending. It should be the shared mailbox if you have Send As.
- Select Send.
Members with the appropriate access can create, view, and manage appointments on the shared calendar, and other members can see the changes. Microsoft also lists events and invitations among the capabilities available when the shared mailbox is added as an account.
If the event was accidentally created on your personal calendar, move or recreate it on the shared mailbox calendar. Changing only the visible From address does not necessarily change which calendar stores the meeting.
Use the shared mailbox in classic Outlook
Classic Outlook may add the shared mailbox automatically. If it does not, add it manually:
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- On the Email tab, select your Microsoft 365 account.
- Select Change > More Settings.
- Open the Advanced tab and select Add.
- Enter the shared mailbox address.
- Select OK > OK > Next > Finish > Close.
Restart Outlook. Go to Calendar and select the shared mailbox calendar. Create the meeting there and confirm that the organizer or From field identifies the shared mailbox before selecting Send.
Use Outlook on the web
You can open the mailbox in a separate Outlook on the web session:
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- Select your name on the Outlook navigation bar.
- Select Open another mailbox.
- Enter the shared mailbox address.
- Select Open.
For Exchange Online, you can also add it to the folder list by right-clicking Folders in the left navigation pane and selecting Add shared folder or mailbox.
Open the shared mailbox’s calendar, create the meeting, and check the sender before sending. If the From field is missing in a new message or invitation:
- Select More actions > Show From.
- The first time, right-click the displayed From address and select Remove.
- Type the shared mailbox address.
- Use the shared mailbox address from the From list when sending later messages.
The displayed address must match a permission you were granted. Typing an address into From does not grant Send As or Send on Behalf.
Common problems and fixes
“You do not have permission to send the message on behalf of the specified users”
This usually means the sending permission does not match the way the message is being sent. In particular, Full Access plus Send on Behalf can still fail when the message is being sent as the shared mailbox. Grant Send As if the invitation should appear to come directly from the mailbox.
Cached Outlook can show an NDR containing an error such as 0x80070005-00000000-00000000 or 0x80070005-0x0004dc-0x000524. Outlook in online mode may display the permission error immediately. In both cases, have an administrator verify the mailbox delegation rather than repeatedly trying to send.
The shared mailbox does not appear
Permission changes can take several minutes to propagate. Close and restart Outlook. If it still does not appear, add it manually using Add shared folder or mailbox in New Outlook or Outlook on the web, or the Advanced account settings in classic Outlook.
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The meeting was sent from my personal account
Make sure you selected the shared mailbox calendar, not your personal calendar, and verify the From or organizer identity before sending. In Outlook on the web, expose the From field with More actions > Show From.
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Users are trying to sign in directly
Do not use the shared mailbox’s address and password as a normal user account. Add each person as a member and have them access the mailbox through their own account. Direct sign-in is not the intended shared-mailbox access model.
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Hybrid Exchange
In a hybrid environment, create and manage the shared mailbox in the on-premises Exchange admin center. Cross-premises mailbox permissions are not supported in Outlook on the web for this scenario, so users must use the Outlook desktop client.
Sending invitations involving a room mailbox
Full Access to the shared mailbox does not grant access to a separate room mailbox calendar. If a user must accept meeting requests for the room, the user may need explicit Editor permission on the room calendar:
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Private calendar items
Private items in a shared mailbox calendar are not automatically visible to delegates. To allow a delegate to view private items, an administrator can grant calendar-level permission with CanViewPrivateItems:
Add-MailboxFolderPermission -Identity mailbox@contoso.com:\Calendar -User user@contoso.com -AccessRights Editor -SharingPermissionFlags Delegate,CanViewPrivateItems
Grant this only when the delegate’s role requires access to private appointments.
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FAQ
Can I send a meeting invite from a shared mailbox with Full Access only?
No. Full Access lets you open the mailbox and manage its calendar, but it does not grant permission to send. Add Send As or Send on Behalf.
Which permission makes the invitation appear to come directly from the shared mailbox?
Send As. Send on Behalf displays both the delegate and the mailbox, such as “Alex on behalf of Support.”
Why can I create the meeting but not send it?
You likely have Full Access but lack Send As or Send on Behalf. Ask an administrator to check Recipients > Shared > the mailbox > Edit > Mailbox delegation.
How long do shared-mailbox permissions take to work?
New membership and delegation changes may take several minutes to propagate. Close and restart Outlook after waiting.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchCan I send from a shared mailbox in Outlook on the web?
Yes. Open or add the shared mailbox, open its calendar, expose the From field with More actions > Show From, and select the shared mailbox address. You still need the appropriate sending permission.
Does Full Access to a shared mailbox give me access to a meeting room’s calendar?
No. A room mailbox is a separate mailbox. You may need explicit permissions, such as Editor, on the room’s Calendar folder.
The Bottom Line
The reliable Microsoft 365 setup is Full Access plus Send As. Full Access lets the user work in the shared calendar; Send As lets the meeting invitation appear to come directly from the shared mailbox. After the administrator assigns both permissions, wait for propagation, restart Outlook, open the shared mailbox calendar, and verify the From or organizer identity before sending.
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