Different people may have different experiences as to how much of Entourage
successfully updated, and of course if it *is* truly just the Info.plist
file that's not getting updated (and therefore not showing the new version
number), this may not be an issue.
In my case, however, I had working system sounds yet Entourage was still
showing 12.0.0. I dug into the actual Office updater package, and found the
four standalone packages used to update Entourage, and applied them manually
(only one is the main application -- the other three appear to update help
files).
This was certainly an easier method than a full rip and reinstall as well.
It took about five minutes as opposed to an hour.
Note that within this package, there is a separate "sound files" package, so
it's entirely possible that the sound files are updated separately *apart
from* the main Entourage code.
What I do know is that even though I wasn't experiencing any obvious
problems (I did have one crash of Entourage before the update, but it's
difficult to say whether that was relevant or not), I'm quite sure I wasn't
on the newest code... In the very least, after the update I had to
reauthorize my Mac OS X firewall and all of my keychain data for the new
version of Entourage to use it. Now, that may be because OS X was only
looking at the plist file or not, but either way I'm certainly more
comfortable now that it's showing 12.0.1.
If you want to do a manual comparison, just open up the Office updater
package, and install the Entourage incremental update packages to another
folder. You won't have a running copy of Entourage (as it's an *incremental*
package that only includes those pieces that have been updated), but you can
then dig in to the incremental package and the original Entourage.app
package and see what the differences are for yourself.