A few weeks ago, Lawrence Liu (a senior technical PM and community lead for Sharepoint at Microsoft) linked to a few screencasts for learning how to use various features in MOSS2007. In that entry, he mentioned how screecasts are more effective and efficient...
The drop-down list of names that Outlook gives us to auto-complete a name or address being written is stored in a file called <ProfileName>.NK2 in our Application Data\Microsoft\Outlook directory. This file is stored in a proprietary binary format...