Outlook slow to open an email with an attachment.
 

My client messaging software is outlook 2000. It connects to a single
Exchange 2000 server with about 250 users. All has been fine for about three
years up until now.
Problem
When a user receives an email with an attachment 300K outlook becomes very
unresponsive until it finally opens after about 30sec. Internal emails are
OK, it seems only when they are received from an external source.

Tried So far.
I have disable Sophos antivirus on Server and PC. Stopped Sophos purmessage.
Restarted services, and also rebooted the server. Paine preview, journaling
off etc



Any suggestions would be greatly appreciated.

Regards
Peter