Outlook Client hangs when receiving email with attachment

What we are seeing is Outlook client at a remote site can send and receive email fine but when they receive a email with a attachment Outlook freezes until the email is populated in the inbox. They sometimes will be in the middle of writing a email message and the Outlook client will freeze not allowing them to type or do anything inside the program, this can freeze anywhere between 30 seconds to 5 minutes or until the user ends the task depending on how large the attachment is. Has anyone seen this type of behavior in Outlook??

The client is running Windows 2000 with office 2000. The clients connect to the Exchange Server at a Central site over a T1 connection.
Email Server is Exchange 2003.
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   If they Offline profile, configure it to download the message headers only and synchronize only in defined times.
PreludeAdminAuthor Commented:
After dealing with this for almost 3 weeks we found our problem (always the obvious). We are using McAfee Virus Scan on the client machines and found that our EPO had set the Email Scanner to enabled which was causing the attachments to be scanned as they were populating the client inbox. After we disabled it there was no more freezes for the clients.
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