Many already did. Ray Ozzie started Groove Networks in 1997 to do file sharing and collaboration, later bought by MS. MS also bought a file sharing company in 2005 to power Live Mesh. That MS failed to nail this market on their own platform is kinda' pathetic. There were a billion other companies before Dropbox. I've never understood the enthusiasm for Dropbox. It's all been done before.
I felt the same until I started using it. As boring as it sounds, just working and being easy enough for your grandparents to use is apparently enough to get people excited. The fact that it's been done (or tried) so many times before really just makes you appreciate it more.
Yeah, MS, Apple, etc. all should've had this figured out years ago and yet they didn't. So boo on them, but it's probably for the better because now we have Dropbox and you can use it on your Mac or in Windows, on your iPhone, Android, or whatever...
