UPDATE (03/13/2008):
There’s an official (but in no way officially advertised) add-on patch for the built-in Messaging, which allows mass “mark read” and “delete” operations. This means you don’t need to switch to FlexMail on the MS Smartphone platform if you frequently need to delete / mark as read all your messages as quickly as possible.
Navigate to
THIS page; get and execute InboxExtender.CAB on your phone. After this, the menu will contain two new menu items:
Mark All as Read and
Delete All.
(WM6 Smartphone and VGA Pocket PC, respectively)
(thanks to HowardForums forum member RF9 for the
heads-up!)