Outlook 2000 and Attachments

Windows 2000 SR3 and Office 2000 SP3-emails (and preview) are very slow to open when messages have attachments (ok with no attachment). Is there something I can configure. User does have offline folder configured–and he is on a dialup/thru a NortelVPN. Any help appreciated-found nothing on Technet. Thanks. Steve Bouse/sbouse@answerthink.com