Doublestack, Novell, IBM, Apple, Netscape, AOL, DEC, all were companies that were turned on in an instant and had to deal with a Microsoft's severely bipolar behavior.
Don't forget Go Corp, who'd likely have given us viable tablet computing 20 years ago if they hadn't insisted on using their own OS instead of Windows. Microsoft destroyed them with extreme prejudice for it.
Also, I think you meant Stac Electronics, not Doublestack. A Doublestack is a burger at Wendy's, and it appears you were posting at lunchtime. Freudian slip, perhaps?
~Philly