Ever want to back up your outlook data, but couldn't find it? Here they are- the secret file locations of many of the most important and least backed up files on your hard drive. Mail, Address Book, Contacts, Favorites, Desktop, etc.

Outlook-C:\Documents and Settings\USERNAME\Local Settings\Application Data\Microsoft\Outlook. The PST file in that folder contains all contacts, calendars, mailboxs, and tasks that are used in Outlook.
Outlook Express- C:\Documents and Settings\USERNAME\Local Settings\Application Data\Identities\{LONG NUMBER}\Microsoft\Outlook Express
Windows Address Book - C:\Documents and Settings\USERNAME\Application Data\Microsoft\Address Book
Netscape Mail- C:\Documents and Settings\USERNAME\Application Data\Mozilla\Profiles\profile_name\salted_name\Mail\each_mail_account