Comscore: Windows Phone US installed base losses continue to slow


Comscore have released their monthly US carrier subscriber numbers today and in line with our prediction from last month, Microsoft’s share of the US phone owner installed base has continued to drop, but at an increasingly slow pace.

While 0.2% less US subscribers owned Windows Phones (a combination of Windows Phone 7 and Windows Mobile), as can be seen in the table below the trend is clearly toward increasingly slow losses as Windows Phone 7 ramps up and replaces the ever dwindling Windows Mobile installed base.

Microsoft Nov-10 Dec-10 Jan-11 Feb-11 Mar-11
US installed base 9 8.4 8 7.7 7.5
Percent loss 0.7 0.6 0.4 0.3 0.2

Looking at the numbers, things should start turning around in the May numbers, and Windows Phone 7 should start gaining share in June 2011.

RIM Nov-10 Dec-10 Jan-11 Feb-11 Mar-11
US installed base 33.5 31.6 30.4 28.9 27.1
Percent loss 2.3 1.9 1.2 1.5 1.8

The news is not as good for RIM, which appears to be accelerating the losses in their installed base, as US subscribers get rid of their crackberries even faster than Windows Mobile users.

Of note is that on this occasion it is not just us that is noticing the trend, with SeattlePI also mentioning things looking up for Microsoft in mobile.