Jun 11, 2005
Jan 16, 2006 What is outlook anywhere | Access your exchange account or Sep 18, 2018 Unable to send SMTP mail over VPN - Google Groups Oct 27, 2007
How to Configure Outlook for RPC over HTTP: 15 Steps
Gmail, outlook and vpn? - Google Search
IMAP and NetBIOS do not perfrom well over VPN connections, period. I am in the process of evaluating several VPN products, and that is the one constant. The workaround is to deploy Outlook Web Access and let the users reach email via HTTP. Performance is much, much improved.