Convert Mailbox to Linked Mailbox

When performing an AD migration it is sometimes necessary to make the mailbox a linked mailbox so that the migrated user can continue to use their email.  When searching online I found the official answer from Microsoft which is to disable-mailbox and then connect-mailbox, however this loses all of the Exchange related attributes.  Of course you can back those up and apply them again later but that is a bit of a pain.

Searching a bit further I found people talking about Set-User and the -LinkedMasterAccount parameter.  This is used to convert a linked mailbox back to a standard mailbox by passing the value $null.  Now Microsoft do not talk about using it for the opposite but it does work.

So here is a script that will convert a mailbox to a linked mailbox while preserving all of the Exchange related attributes.

*** As always the script is provided on an as is basis, please test it before you use it in a production environment. ***

Convert-MailboxToLinkedMailbox.ps1

Twan van Beers

Twan is a senior consultant with over 20 years of experience. He has a wide range of skills including Messaging, Active Directory, SQL, Networking and Firewalls. Twan loves to write scripts and get deep and dirty into debugging code, in order to understand and resolve the most complex of problems.

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