Wow. You seem to have a selective memory. MSFT experimented with multi-touch using cameras and projectors, not capacitive screens. MSFT Surface was originally done using projectors and cameras to capture gestures and devices on the table.
Apple bought fingerworks which did the original research on multitouch using capacitive screens. Go look it up.'
Funny. Before accusing someone of selective memory, try to do some research. Some pointers that should give you a head start :
http://users.erols.com/rwservices/pens/penhist.html
http://cerncourier.com/cws/article/cern/42092
http://iconia-6120.com/multi-touch-displays/
http://issuu.com/winnyvisva/docs/multitouch-timeline
If you think iPhone is the first PDA/touch-screen only device, try this one :
http://en.wikipedia.org/wiki/IBM_Simon
Apple might have some patents, but that's the irony of the suing someone to protect the patent, they most likely lose that patent forever, because it is obvious this is a prior art.