The people at xda-developers.com found a way to install Windows Mobile 6 on the HTC Blue Angel (also known as MDA III and others). They have created a page in their wiki with a wizard which describes in detail how to install WM6:
http://wiki.xda-developers.com/index.php?pagename=HTC_Blueangel_WM6_Home
After the update, the memory management will be different:
With Windows Mobile 2003 SE, you have the RAM memory (about 100 MB) both as a data memory which contains installed programs, data and as a program memory which contains programs while you run them (you can define how much memory each part has). In your file manager, you find “Storage” which is an internal flash drive (about 43 MB) where you can put backups etc. The operating system is saved in the ROM memory, and there is also an Extended ROM memory which contains .cab files that are installed after each hard reset (in my T-Mobile MDA III: ClearVue apps, TrueFax, …).
Windows Mobile 6 will be flashed to the ROM memory. It uses the RAM memory as a pure program memory (like your computer). The internal flash memory acts as your data memory (hence your data won’t be lost after an empty battery anymore). The Extended ROM memory won’t be needed anymore. As you now have only 40 MB of data memory, you can merge the internal flash memory and the extended ROM memory to one big data memory with more than 60 MB.
The wiki site tells you how to do so. You have to install a .cab file which contains four small tools which you can find in your program folder. You must unhide and unlock the extended ROM memory. Using the .exe file, you must format it.
After this, the update process can begin. Expect the next article soon.