Running Outlook on 3 different computers

My Outlook account could not receive any emails through Exchange Server 2003. I have tried to set up Exchange on three distinct computers but it keeps on hanging on a certain percentage. As of now, it stuck at 57%; however, it hangs on certain percentage each time. Obviously it’s not a matter of perspective. Is there any issue running Outlook 2003 and 2007 on three distinct computers? Is it the issue that is causing problem with my mailbox? Any ideas on how should I solve this problem?
