A post in HowardForums indicates that the T-Mobile Dash (also known as the HTC Excalibur) could be upgraded to Windows Mobile 6. These reports come from T-Mobile Engineering, the sector responsible for testing and approving updates for devices.
Little other information is available at this time but this might explain why the HTC Cavalier (the Excalibur’s successor) is currently “indefinitely postponed”. That and the fact that Jason Dunn writes, I have a very strong hunch this is accurate .
Source: Smartphone Thoughts