Microsoft was also after Motorola

I think MS was just messing with Google. 

Google may not have had much of a choice when it came to buying Motorola Mobility for $12.5 billion. If it didn’t, someone else would have and that would have put the company in an even bigger patent hole.

Our sources say that Motorola was in acquisition talks with several parties, including Microsoft for quite some time. Microsoft was interested in acquiring Motorola’s patent portfolio that would have allowed it to torpedo Android even further. The possibility of that deal brought Google to the negotiation table, resulting in the blockbuster sale. 

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