Microsoft has set dates in 2014 for the end of mainstream support for both Windows Phone 7.8 and 8.
The company will cease support for 7.8 on Sept. 9 and for 8 on July 8. Both of the end dates are based on 18-month life cycles for the products.
The news does not mention upgrades for either version of the operating system but does offer a bit of information on updates. Microsoft said it will continue updates, including security updates, but adds that the distribution of updates may be controlled by the carriers or OEMs.
Windows Phone 8 launched late last year and 7.8 was made available earlier this year as an upgrade for customers using Windows Phone 7.
In its three-month study ending in November 2012, Comscore found Microsoft controlling three percent of the U.S. mobile OS market share.