Convert a linked mailbox to a user mailbox

In our Exchange environment we have a mix of user mailboxes and linked mailboxes because the users are in different Active Directory domains.  Today I have to move some users into the same domain that Exchange resides in so will be converting their linked mailboxes to regular user mailboxes.  This can’t be done using the EMC so I will be running the following PowerShell command for each user:

Set-User -Identity dave.webb@ourdomain.local -LinkedMasterAccount $null

Note: This will remove all permissions on the mailbox (such as Send As, Full Access and calendar delagtion, etc)