Messages cannot be downloaded

[durius]

Everytime I try to download e-mail through ActiveSync, I get this message:

"Messages cannot be downloaded to your mobile device. Make sure you are connected and that your e-mail account settings are correct. Then, try to download messages again.

I have checked all details and all seems fine, but still cannot connect to e-mail server.
I can browse internet pages with Internet Explorer.

Thanks for your help.

[durius]

Could this be the problem?

In the network cards setting which option should I choose: My network card connects to work or to the internet.
Everytime I choose internet it goes back to work...
Is there a way for the setting to remain?