On Mon, 26 Jan 2015, Alan Zisman wrote to Holger Granholm:

 AZ> Microsoft for a version of Basic; while MS was talking with them,
 AZ> they mentioned that they might be able provide an inexpensive
 AZ> operating system - and went and purchased another Seattle company
 AZ> which had a clone of the then-popular CP/M - and hence MS-DOS was
 AZ> 'born'.

i don't think that m$ ever purchased Seattle Computer Products... they only
purchased the rights to their QDOS (which was aka 86-DOS) which then then
mangled into DOS as we know it...

)\/(ark