You can accept meetings on behalf of the other user if you are in that users inbox or calendar, and you have delegate access.
If you're in your own store, and you just want to send mail on behalf of another user in Outlook, then when you create a new mail, you can do Options->Show From, and type anything you want in there. Some people consider this a security hole, but there's really a trail -- it would say user1 on behalf of user2.
If you want to send as somebody else (as opposed to send on behalf of), you can create a persona in Outlook (Tools->Options->Personas). You need proper server permissions for that. |