AT&T Lumia 900 most likely first update in US
After an oft-delayed start, the Windows Phone 7.8 update has begun its rollout to some phones currently on Windows Phone 7.5. Starting today and proceeding through February a message will appear on the screen of users' Nokia Lumia 510, 610, 710, 800, and 900 handsets encouraging the update. Rollout timing is operator dependent, with the AT&T Lumia 900 expected to lead the pack in the US. Unlocked phones may have the update available earlier.
Lumia 510 released in India, Lumia 505 in Mexico
Nokia has reportedly started to roll out Windows Phone 7.8 to some of its handsets. At the same time as the mobile operating system upgrade to some of the company's handsets, Nokia has also launched the Lumia 505 in Mexico, and the Lumia 510 in India, both of which will launch with Windows Phone 7.8 out of the box.
Server details show upgrades for multiple regions, carriers
Windows Phone updates for a number of Nokia handsets have appeared on the company's servers. The upgrade from Windows Phone 7.5 to 7.8 for the Lumia 610, Lumia 710, and Lumia 900 have been sighted on the server, complete with region-specific versions for each handset, though a formal update has yet to be announced.
Windows Phone update expected globally shortly after
Microsoft is set to launch Windows Phone 7.8 for the Chinese market in the "coming weeks." The comments of the Greater China Vice President of Microsoft made the comments, suggesting that a release of the upgrade for older handsets will be taking place in the rest of the world in the not too distant future.