Thank you cakemaster! I'm downloading it now. Thanks again for the update.
I downloaded and installed 4.0.0.185 from the tmobile website.
http://www.t-mobile.com/products/default.asp?class=pda
Select your model and click on the "system upgrade" link on the left of the screen. You must allow pop-ups for the window to open.
They have a Desktop install file and an OS upgrade file available.
I was running the AT&T OS4.0 and the desktop software recognized the t-mobile as a software upgrade and installed it accordingly. It functions the same for the most part. I think some of the applications respond faster while they're transmitting data. (i.e. - the phone and message app.)
The upgrade reset my personal settings and of course I had to re-regeistar Web Viewer from rqwireless. All of my pictures were removed and everything goes back to the default t-mobile settings. The databases are in tack, but any custom settings you had will be reset.
E-mail settings and web browsing remained okay and my Magmic game remained registared and worked flawlessly after the upgrade.
Nothing ground breaking if you already were running 4.0, but it seems there are no glitches with the t-mobile 4.0