I removed one email address in the Exchange Server and created another one with the same address. Now I can not send messages to that address as it says no user exists, but I can see the new user in management console. I can't connect to server using this email..... I'm very new in Exchange Server and any help would be appreciated. Thanks
You probably have a cached entry on the Outlook client pointing to the old address. Reload your OAB and delete the old email address from the NK2 file cache (Open a new message, start to type in the address, when the drop down appears with the address, hit Delete). Then try to send it again.