- VPN to ISA running
- Control Panel -> Mail -> Profiles -> Properties
- Select Open Loacation
- Delete all files in the Outlook folder and delete the Profile too
- Open Outlook and create a new Profile
- Select Manual configuration server -> Next
- Select MS Exchange -> Next
- Server: 10.3.3.3
- User Name: Alias for the Mailbox
- Check Name -> Next -> Finish
- Restart Outlook if asked