Well, I think I've solved that one. I have ActiveSync at my office computer, and, because of the damn proxy server, Desktop AS can't reach my Exchange server, so, the PocketPC keeps trying to reach it.
BTW, did you try to watch any video on the Treo? Even with the stock ROM, it's unplayably slow. The same file, on the same card, plays fine on my HTC Universal. Is it possible to try installing another MSM7201A-based device's SD card drivers?
Sao Paulo, Brazil
Palm Treo Pro (HTC Panther) 
Past: Palm Z22 + Nokia 6020  > Palm Tungsten|E2 + 6020  > HP iPAQ hx4700 (HTC Roadster) + 6020  > iPAQ + Motorola RAZR V3  > O2 Xda Exec (HTC Universal G4 2.01)  > Nokia 5800 XM  > Motorola Spice XT300  > Xda Exec [again, 2012]