All the vowels were listed as is, but the consonants were consumed by the Translbonians. The vowel combinations were listed in alphabetical order, so AA=B, AE=C, etc. The last character UI indicated a space or end of word, so the email the boss sent, translated into english reads as follows:
Try writing emails in an all vowel code.
I definitely got a lot of comments on this one. tough crowd! Try creating and writing a message in an all vowel code within the constraints of Dilbert's email system on the remaining 15 minutes of your lunch break and see what you can come up with! Yeah, I should have used Headcount or something to that effect instead of typing Dilberts name, but I thought it was cute idea and sounded like something PHB would come up with to not fix the problem.
I'm sure tyhill got it right a couple of pages back. If Dilbert goes as far as to say a$$hole--and it's going to be cleverly disguised by SA--he might as well go all the way to hail and say the "F-word."