Will Apple's Lion Roar For Business?
AD is incredibly easy to integrate with. There are thousands of third-party applications, including open source packages running on Linux or Java which integrate successfully with AD, since it is so easy to do. It is actually a little easier to perform user authentication against AD than against OpenLDAP (for example) using standard LDAP libraries.
Federal Court Says First-Sale Doctrine Covers Software, Too
Sadly I have to report a similar olfactory experience. So much for the UID/shit-stinkiness correlation.