To add to my thread, our office also uses Samsung Galaxy 10.1 Tablets (software version 3.2) and those tablets do not sync with Exchange when connected to the office Wi-Fi network either. Though the tablets do not generate a connection error as the Droid X phone does and the e-mail appears to sync correctly but no new e-mail is deposited onto the tablet. The only way to receive the most recent e-mail on the tablet is to switch over to the 4G network.