If you need to change the purpose of an existing Exchange Mailbox, for instance changing a User Mailbox to a Shared Mailbox or maybe the other way around, changing a Shared Mailbox to a User Mailbox.
Could also be changing to a Room or Equipment.
This an relative easy task to change. Make sure your running the Exchange Management Shell or are connected Office 365 (see previous post).
Change a mailbox to a Shared Mailbox, using the following PowerShell command:
Get-Mailbox -Identity firstname.lastname@example.org | Set-Mailbox -Type Shared
The different Recipient Types you can set on a Mailbox are:
Show a list of mailbox and their Recipient Type, using the following PowerShell command to validate your configuration settings:
Get-Mailbox | ft Name, RecipientTypeDetails
The above commands works fine on Exchange 2007, Exchange 2010 and with Office 365.