An update - the official acronym is "Dub Eff" if you need to shorten it of course, othewise it's Windows Workflow Foundation!

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Don seems to have coined the "Dub Dub Eff" pronounciation of WWF (Windows Workflow Foundation), it was well needed as people give you strange looks when you pronounce it (DoubleU, DoubleU, Eff) as they instantly think of the World Wildlife Fund or World Wrestling Federation :-)

"Dub Dub Eff" it is!