Running Exchange 2007 SP2 in a Windows 2008 AD forest (Resource.com). We have user accounts in Domain.com. There is a full trust and all the mailboxes in Resource.com have been created as linked mailboxes and linked with the Domain.com accounts. Everything working fine for all users. Except, I have one or two users who cannot access their mailbox since this morning using Outlook/OWA using their Domain.com accounts. Keeps saying wrong password/ not authorised. Is there any way I can unlink the mailbox from the Domain.com account and re-link? Also, where would the logs be to troubleshoot the issue?

You say everything is working with your linked mailboxes, except “one or two users who cannot access their mailbox since this morning using Outlook/OWA using their Domain.com accounts.” Before you unlink and relink these mailboxes, I would have issued these two commands, the first to make sure that the correct user is linked to the correct mailbox; the other to see when this mailbox was last logged on to, and with which account: Get-Mailbox -Identity User1 | List DisplayName, RecipientTypeDetails, LinkedMasterAccount Get-MailboxStatistics -Identity User1 | List DisplayName, LastLoggedOnUserAccount, LastLogonTime For the last three years I have been working a lot with linked mailboxes on Exchange 2007 / 2010. I have never seen an issue with broken links. The most likely reason is mistyped password, password expired, account locked. In order to unlink and relink, this procedure should work. It is the same way you would convert a user mailbox to a linked mailbox, but you should test it first with a new linked mailbox. When you see that it works, copy all SMTP and X500 information for that particular mailbox, as you will loose it when you disable the linked mailbox (which removes all Exchange-specific attributes). # Remove Exchange attributes Disable-Mailbox -Identity User1 # Assuming this is the database Clean-MailboxDatabase -Identity MDB04 # You need to supply valid credentials for domain.com $cred = Get-Credential # The actual reconnect Connect-Mailbox -Identity 'User1' -Database "MDB04" -LinkedDomainController DC-01.domain.com -LinkedMasterAccount user1@domain.com -LinkedCredential $cred -User user1@resource.com Convert Linked Mailboxes http://technet.microsoft.com/en-us/library/bb201694.aspx MCTS: Messaging | MCSE: S+M

As the error message indicates the password error, i'd suggest we type the credential/password in a notepad, then copy and paste it in OWA to make sure it is correctly entered. If it does not work, reset the password in domain.com, then use domain.com/owa to trya gain. It may help us isolate the fault from lined mailbox. -Fiona.Please 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.