The official MS blog spins some numbers:
Some are really interesting and tell you something about what MS's numbers are like:
<10
Percentage of US netbooks running Windows in 2008. [source]
96
Percentage of US netbooks running Windows in 2009. [source]
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24%
Linux Server market share in 2005. [source]
33%
Predicted Linux Server market share for 2007 (made in 2005). [source]
21.2%
Actual Linux Server market share, Q4 2009. [source]
Some are uninteresting and tell you absolutely nothing:
16 million
Total subscribers to largest 25 US daily newspapers. [source]
14 Million
Total number of Netflix subscribers. [source]
23 million
Total number of Xbox Live subscribers. [source]
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173 million
Global Gmail users. [source]
284 million
Global Yahoo! Mail users.[source]
360 million
Global Windows Live Hotmail users.[source]
299 million
Active Windows Live Messenger Accounts worldwide. [Comscore MyMetrix, WW, March 2010 - requires subscription]
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21.4 million
Number of new Bing search users in one year. [Comscore report – requires subscription]
I think that MS's greatest accomplishment in the last decade or so has been the Xbox. They plunged headfirst into one of the most difficult tech markets and not only survived but thrived. Ironically, it had little to do with 'synergy' or marketing gimmicks or because people had a predisposition to buy the Xbox because of the Microsoft name, but because they put out a high quality, kick ass product. They innovated and it paid off. It's extra impressive because a gaming platform really wasn't in their corporate DNA.