Well, I got the same problem, but internet access on my axim works, so this is no sollution for me. It worked fine for months, then I had to change my x51v for a refurbished one, and I get no connection to Exchange at all, not by craddle, not by WLAN. I tried installing the SSL-certificate, sync with SSL, without SSL, everything I could even think of, and now I'm running out of ideas.
