The Exchange Server 2007 SP3 bits are available online in 11 languages and on two platforms (32/64bit). The accompanying documentation includes: Release Notes and What’s New in Exchange Server 2007 SP3.
My fav is this 🙂
Exchange 2007 SP3 introduces password reset functionality for Internet Information Services (IIS) 7. For more information, see How to Enable the Exchange 2007 SP3 Password Reset Tool.