Set-Mailbox -Type Shared

Set-Mailbox -Type Shared PowerShell command

At some point, you may want to convert a user mailbox to a shared mailbox. Perhaps as part of your Office 365 mailbox life cycle management when a user leaves your organization.

This post will show how to convert an Office 365 mailbox to a shared mailbox using the Set-Mailbox PowerShell command.

You’ll also see how to do it via the Active Directory Users & Computers management console and the Exchange Admin Center.

Mailbox Conversion Using PowerShell

Use the Set-Mailbox PowerShell command to convert your Office 365 mailbox to a shared mailbox. The below example shows you how:

Set-Mailbox -Type Shared

Start by establishing a connection with Exchange Online (lines 1 – 3).

Convert the mailbox type using the Set-Mailbox command (line 4).

End your Exchange Online session when done (line 5). If you don’t explicitly close the session, you risk depleting the number of available sessions.

To convert your mailbox to other types than Shared, use these parameters: Regular (user), Room, and Equipment.

To verify the conversion, take a look at the RecipientTypeDetails of the mailbox:

PS C:\WINDOWS\system32> Get-Mailbox Marketing | fl Name,RecipientTypeDetails

Name                 : Marketing
RecipientTypeDetails : SharedMailbox

License Considerations

A shared mailbox in Office 365 does not require a license, but you need to have your own personal mailbox (which must be licensed) to access it. Also, if you want your shared mailbox to store more than 50 GB or to have an archive, you need to license it.

Keep in mind that you shouldn’t delete the user account after converting the mailbox to a shared mailbox. The user account is still needed, although you can’t use it for logging in.

Mailbox Conversion Using Active Directory Users & Computers

Another option to perform the mailbox conversion is using the Active Directory Users & Computers MMC.

You need to have the Easy365Manager snapin installed to follow this procedure.

Open up user properties and go to the Mailbox tab. Here you can select any of the four mailbox types to convert the mailbox:

Office 365 mailbox conversion using Easy365Manager

After converting the mailbox to a shared mailbox, you can remove the license. You can also do this using the Easy365Manager tool, as seen in the following screenshot:

Office 365 mailbox license configuration with Easy365Manager

Alternatively, you can use the Office 365 Admin Portal to remove the Exchange Online license.

Easy 365Manager can make your admin life a lot easier. Stop switching between multiple admin tools throughout the day. Manage all AD user and email configurations, Office 365 mailboxes and Office 365 licenses from AD Users & Computers.

Get rid of your on-premises Exchange Server.

You can discover more Easy365Manager features here.

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Mailbox Conversion Using the Exchange Admin Center

You can also perform mailbox type conversion using the Exchange Admin Center. To change the mailbox type, follow these steps:

Open up the Exchange Admin Center using your admin account and locate the mailbox you want to convert:

Convert Office 365 Shared Mailbox using the Exchange Admin Center

Clicking “Convert” will generate a warning and clicking Yes will start the mailbox conversion:

Office 365 Mailbox conversion warning
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