"The problem is that Adobe made PDF so flexible with so many features that it's impossible to block all the various exploits, not to mention that Adobe themselves don't have a very good track record with security" You mean like that pesky Winders operating system?

Glad you had a nice experience. I, however, did not. Turns out that XP SP3 looks for the Beethoven.mp3 sample file on your host and if it's not there, PRESTO, instant nag screen and no SP3 upgrade. Excellent QA Microsoft.