I also have the same problem (even had a thread on this problem but NO ONE replied), I can 'connect' to the Internet through Activesync BUT only by using ip addresses, for example using
http://216.239.39.99 will take me to Google where I can search for something (example aximsite) which will give the sites with the word aximsite in it) BUT if I click on the link to open it I get an error "Cannot open page...". It means I cannot access Internet to update weather etc.
I cannot find pass through to see if that will work. I have Journal Bar on my X51V but cannot use it to get weather or other info from Internet. Waiting for someone to show us how to get it...