$500M spent to buy Danger in 2008 plus assumption of debt and the $260M write down they later took on discontinuing the Kin in 2008. So probably around $.75B - that is still a ton of phone licenses they would need to sell to recoup.

And that isn't even taking into account the R%D spent on the Windows 7 phone, which they are said to spend $400M on marketing for.

If Apple was only selling OS licenses for the 14M iPhone4's it shipped at MS's price, they would only have made $112M-210M in revenue.

http://gorumors.com/business/microsoft-kin-revenue-loss/6154... http://techcrunch.com/2010/08/26/microsoft-half-billion-doll...

One report says Microsoft spent $500 million acquiring Danger as part of the Pink/Kin project. http://gigaom.com/2008/02/12/how-much-did-microsoft-pay-for-...