I've spent the past four and a half years of my professional life working on reverse engineering and accelerating the Microsoft Exchange email protocol for Riverbed Technology, Inc. It's been a maddening journey, and it finally comes to a close this Friday, as I have accepted a position with the Tor Project starting January 1st. What follows is my farewell email to the company. I somewhat regret not documenting the exploits alluded to in this email better outside of various Riverbed email lists. Maybe someday when the statute of limitations is up I'll declassify them and post them retroactively here.