Dear all, I've changed the exchange alias of one of the users from 'mustafaak' to 'mustafaa'. (His e-mail address was mustafaa@xxxcorp and it was not been changed) When I check it at the AD Users & Computers I can confirm the change. However, when I try to send an e-mail via Outlook, the alias is still 'mustafaak'. I've changed the alias today morning, it is now 17:00 and still the alias is the same. Do you have any suggestions?