Hi Ever since I installed the Enterprise Edition on a Small Business Server 2003 Premium none of the users can receive emails. I was running Symantec Antivirus without any issues. Thanks for any help. Just done some more testing and find if you do a Test Account Settings through Control Panel > Mail I get 5 green ticks. But if I do the same through Outlook > Tools > E-mail Accounts it fails on 2, the POP3 tasks. But if I use Outlook Express POP3 works. If I uninstall NOD32 on the workstation, I still get the same result.