Modify "Linked","Legacy" and "Shared" mailbox types in Exchange 2010

Every now and then Exchange messes up the mailbox types after moving between databases.
Here's how to change the mailbox types:

Linked;

Set-User "User Name" -LinkedMasterAccount $null

Legacy;

set-Mailbox alias -ApplyMandatoryProperties

Shared;

Set-Mailbox "Alias" -Type Regular

From user type to Shared type

Set-Mailbox "Username" -Type Shared