We just posted about the app 'Dude, Where is my Update?' which focuses on the NoDo OS upgrade (and presumably future ones). In version 1.1 a statistics collecting feature was added which anonymously garnered your OS version and device model numbers--something we thought would be useful.

Looks like some folks at Microsoft or partnering OEMs saw the app too and were curious. One of our readers, larryb, noticed a few hitherto unknown builds of Windows Phone 7, presumably early builds of 'Mango' or at least branches leading to that goal:

  • 7.0.7003 (old)
  • 7.0.7008 (old)
  • 7.0.7355 (old)
  • 7.10.7608 (1 user)
  • 7.10.7613 (2 users)
  • 7.10.7614 (2 users)

The builds which are in bold may signify a new milestone with the 7.1.xxxx denotation versus the earlier 7.0.xxxx. Currently, the latest confirmed build is 7.0.7390 and the most frequent for NoDo is 7.0.7389. Interestingly, we don't see any '7.0.7753' builds, leading one to believe that the Windows Phone Italy post may be hoax/faked.

The app, 'Dude, Where is my Update' has a "local" setting which seems to be pick up all US based users of the app who have run it, giving us a unique insight into the ongoing development of the OS. It will be interesting to see if Microsoft employees will continue to experiment with the program (the app generates an anonymized, non-reversible ID, making it impossible to trace back). You can grab the app here in the Marketplace.