I work in the College of Engineering for a major southeast research University. One problem that kicked our tails for 6 months was that Eudora 5 on Windows would produce mime boundaries with "Plain and Styled" mail that there own software would misinterpret trying to pull from IMAP servers. Qualcomm gave us the poorest customer service I have ever experienced (and we deal with a lot of Engineering software manufacturers not exactly known for their customer support).

I really think that Apple OS choices, even given Apple's imperfections, is the least of Qualcomm's problems. We are definitely down the path of migrating our users away from the software - probably to some like Mulberry.