TogglePIE is a freeware application for Windows Mobile 2003 and 5.0 based Pocket PC devices that allows you to toggle between and change the Pocket Internet Explorer/Internet Explorer Mobile’s referrer/indentifier header string to any one of the following desktop browsers:

Internet Explorer 6
Internet Explorer 7
Opera
Mozilla Firefox

This is useful if, for example, some website requires you to load and navigate only through a particular browser even though it will load and work on the Pocket PC’s browser.

After making any changes, you will need to kill Pocket IE process from Running Programs on your device before the setting is applied.

Download Links
ARM version here
ARM4 version here