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As Hans said, the archive flag is turned on whe a file is created or changed. Then, when you use backup software the archive flag is turned off until until the file is changed again.
The Archive flag is used by backup software to identify files that have changed since the last backup to allow you to do "incremental" backups. Obviously, incremental backups only copy files that have the archive flag turned on.
The archive flag can be reset manually, as you saw. It can also be reset by a user in a batch file using the XCOPY command with the /A parameter to recognize files with the archive attribute turned on.
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http://office.microsoft.com/en-us/outlook-help/learn-where-menu-and-toolbar-commands-are-in-office-2010-HA101794130.aspx - Silverlight applets Mapping 2003 menu to 2010 ribbon for all Office apps.
http://office.microsoft.com/en-us/training/HA102295841033.aspx -Flash Applets mapping Office 2003 menus to 2007 ribbon.