I was wondering if you can help me, we've created a new domain and linked this with the old domain on the system. For the time being we've given the users from the new domain access to there old mailbox which is work perfectly. The issue we've come across is when one user signs into multiple computers at the same time and tries to use outlook. when the user does this only the first instance of outlook works which means they have to find the previous computer they signed into. Any Advice would be appreciated?