Microsoft not sure if it’s going to upgrade WP7 to Windows Phone 8

http://static.arstechnica.net/assets/2012/04/lumia_900_holding-4f7b5a8-intro-4f8

We’ve expressed concern about the prospects of upgrading current first—and second—generation Windows Phone handsets to Windows Phone 8, codenamed Apollo, when it is released later this year. Microsoft refuses to commit publicly, and we’ve heard from employees within the company that some or all current users won’t be able to upgrade, even those who buy new, second-generation devices. Others have heard similar tales.

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Story added 18. April 2012, content source with full text you can find at link above.