In the olden days we used to call VSTO visto.
Then MS started talking about vista and it all got a bit scary – if someone said that vist_ is rubbish, no one knew if the were referring to their unusable version 0.9 office customisation technology, or their unusable version 0.9 operating system.
So the word came from on high that henceforth (2003?2004?) the office customisation tech shall be known as V-S-T-O, V.S.T.O. – whatever but not anything with a i in it.
It always makes me think of this:
ha ha ha
(I have always hated that song)
wait for the d, delirious, i, instantaneous, s, source control, c, curly brackets, o, object oriented
shame there is no m for memory leaky