Out look Web access from Internet

This is regarding the OWA from Internet.

As we are setting up VPN server which will allow access to office applications over Internet in a secure way. VPN server which we are installing is Aventail ? SSL based VPN server. Plan is to allow employees to access mails from internet/ RAS using OWA.

To allow access through OWA, mails flowing through should be scanned for malicious content like viruses/ worms.

This criterion should be met before we allow mail access to users. Please confirm back how you want to proceed on this.

Thanks and regards
Jaleel