Hi We have two forests - our original AD forest (ADForest) running Windows 2008 DC and also an Exchange 2007 forest (ExchangeForest) holding user mailboxes. There are trusts etc set up, but I was wondering how this would all work. For instance, I have a manager's mailbox in the Exchange forest. I want to give an Assistant access to that....do I just give access to their ADForest account? Wil this mean that their Outlook can access the Manager's one?

Hi Joe, You environment: AD forest (ADForest) running Windows 2008 DC Exchange forest(ExchangeForest) holding user mailboxes. Trust has between created between two foreasts. You problem: You have a manager’s mailbox in the Exchange forest. You want an assistant can access the manager’s mailbox. If manager’s mailbox is a linked mailbox and assistant account is in the AD forest, please refer to this similar thread: Associated external accounts Exchange 2007 http://social.technet.microsoft.com/Forums/en-US/exchangesvradmin/thread/496162db-033b-4806-a456-1673aea959dc If manager’s mailbox is a linked mailbox and assistant account is in the Exchange forest, you can just give mailbox “full access permission” to the assistant account: How to Allow Mailbox Access http://technet.microsoft.com/en-us/library/aa996343(EXCHG.80).aspx If I misunderstand you problem, please feel free to let me know. Thanks, Evan 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.

Hi Joe, You environment: AD forest (ADForest) running Windows 2008 DC Exchange forest(ExchangeForest) holding user mailboxes. Trust has between created between two foreasts. You problem: You have a manager’s mailbox in the Exchange forest. You want an assistant can access the manager’s mailbox. When you want assistant to access manager’s mailbox, you should give mailbox access to assistant account. Please refer to these documents: How to Allow Mailbox Access http://technet.microsoft.com/en-us/library/aa996343(EXCHG.80).aspx Thanks, EvanPlease 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.