Office 365 Mailboxes

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Hey everyone – Justin here.  I’ve been getting a lot of questions this week about what to do if you want or need to convert a full (user) Office 365 mailbox into a Shared Mailbox.

Here’s a breakdown of how to Convert User (Full) Mailbox to Shared:

In order to convert an established, full (user) mailbox within Office 365 into a Shared Mailbox where you don’t have to burn a license, you will need to run the PowerShell cmdlets below:
Set-Mailbox usertoconvert -Type shared

Set-Mailbox usertoconvert -ProhibitSendReceiveQuota 5GB -ProhibitSendQuota 4.75GB -IssueWarningQuota 4.5GB

Where, “usertoconvert” = one of your mailboxes that you want to convert.

Thus, if you wanted to do this to a mailbox named “Warehouse” mailbox, the commands would be:
Set-Mailbox Warehouse -Type shared

Set-Mailbox Warehouse -ProhibitSendReceiveQuota 5GB -ProhibitSendQuota 4.75GB -IssueWarningQuota 4.5GB

After you run these commands, you can then access the account within the Office 365 portal and safely remove its license, thus putting it back into the pool with your other unused licenses. Because the mailbox is now “shared”, this won’t affect the integrity or availability of this mailbox.

NOTE: For the mailbox names that have spaces in them, you would surround them with quotes “” within the commands above. Thus, the cmdlets would look like:

Set-Mailbox “Jane Doe” -Type shared

Set-Mailbox “Jane Doe” -ProhibitSendReceiveQuota 5GB -ProhibitSendQuota 4.75GB -IssueWarningQuota 4.5GB

That’s all for now.  Stay tuned for our next Tech Tip for the Week!  If you have any questions on this or any other topics, leave a comment and we will answer it.