Dear Microsoft
I have just bought a copy of Windows 7© and I am a little concerned that if your business collapses you will not be in a position to fix any bugs I might find. Therefore, would you mind awfully putting a copy of your complete source code base, development tools, test suites and documentation into safe keeping with "Dodgy Dave's Software Suppository and DVD Copiers" He promises not to look at it, or accidentally release it into the interweb thingy - and it almost never happens that anyone breaks into his office and steals anything (well, not anything valuable, anyway).
regards
Pete 2 xx