MS for a long time has had the fortune of being a monopoly with its OS and office software, but now is being threatened in several different products areas now.
It's phone OS is losing marketshare to Android hand over foot and so is the Iphone. Already, we have Android netbooks, as android is smaller/cheaper/ faster than the netbook version of windows. Soon, MS will be losing more marketshare with its phones and netbooks, not good.
Also, it is losing marketshare with its biggest cash cow, MS Office to OpenOffice. OpenOffice is still fairly small in the US but it's gaining, most importantly b/c it is free and well made.
Also, its browser is losing marketshare, as the android OS is gaining so will Chrome (on netbooks for now anyway).
Sell your miscrosoft stock, it ain't going up!