We not sure exactly why, but it seems the Verizon HTC 8X will lack the Group Messaging feature that is part of Windows Phone 7.5 and 8 on AT&T.

The group messaging service still works on the HTC Trophy, showing it is not a CDMA issue, leaving us to believe that Verizon has done their usual thing and been fiddling with operating systems being released on their network, an issue we had hoped would not be affecting Windows Phone to the same degree as Android.

Via WPC.