Comment: Microsoft uses dirty tactics (Score 2) 492
Microsoft makes a "cooperation" deal with companies to work together on their technology, steals the sourcecode/technology and then ends the contract.
This was the case with IBM's OS/2, Corel Word, Oracle's Database and Stac Electronics' "Stacker" where Bill Gates himself famously lied in a sworn testimony about the theft.
These are just from the top of my head, I am sure people can come up with other examples.