Hi Exchange 2007/ AD 2008 and using linked mailboxes. User account forest: ad.com Resource (mailbox) forest: exchange.com So we have set up our mailboxes so that users log onto AD.com domain on their PC's, but access mailboxes in the Exchange.com forest. The mailboxes are set as linked mailboxes to the AD.com accounts. Some users are going to be switching to another Business Unit of the company where they use a different AD forest. So the requirements will change to: User account forest: ad2.com Resource (mailbox) forest: exchange.com We will also be setting up the same trusts between AD2.com as AD.com. But how do we change the 'linking' of the mailboxes to point to the different AD accounts?

Hi, You need to disconnect the mailbox from the current user and then reconnect the mailbox to the new account. http://technet.microsoft.com/en-us/library/bb201701(EXCHG.80).aspx Leif

Hi, I'm thinking that you can use set-mailbox cmdlet to reconfigure your linked mailbox properties. Set-Mailbox -Identity "MailboxName" -LinkedDomainController "AD2DomainController" -LinkedMasterAccount AD2.com\john -OrganizationalUnit Users -UserPrincipalName john@contoso.com -LinkedCredential:(Get-Credential AD2.com\Admin01) http://technet.microsoft.com/en-us/library/bb123981.aspxPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.