| Microsoft | May-11 | June-11 | July-11 | Aug-11 | Sept-11 | Oct-11 | Nov-11 | Dec-11 | Jan-11 | Feb-12 | March-12 | April-12 | May-12 |
| US installed base | 5.8 | 5.8 | 5.7 | 5.7 | 5.6 | 5.4 | 5.2 | 4.7 | 4.4 | 3.9 | 3.9 | 4.0 | 4.0 |
| Percent loss | 0.9 | 0 | 0.1 | 0 | 0.1 | 0.2 | 0.2 | 0.5 | 0.2 | 0.5 | 0 | -0.1 | 0 |

The start of every month is Market Share time, and the latest to roll in is Comscore.
The data shows that Windows Mobile + Windows Phone market share has remained stable over the last 2 months, while the market grew about 3% since last month.
The current plateau is clearly due to the Nokia Lumia 900 launch in the USA, though it is a pity the share did not actually increase from April to May.
There are currently 110 million smartphone users in USA, meaning we can celebrate 4.4 million Microsoft Mobile operating system users, up 120 thousand from April 2012.
See all the data at Comscore here.
IPhone was introduced is not really reasonable. " Google co-founder Larry Page opined that that Mr. Jobs claim that Google went into the phone business in order to challenge Apple iPhone was false.
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