Best-Selling System Utilities for Corporate Use by Unit Volume* (North America):
1. Symantec Antivirus, Symantec

3. NeatSuite, Trend Micro
4. Clnt/Svr, Trend Micro
5. ScanMail, Trend Micro
6. Active Virus Defense, McAfee Inc.
7. Diskeeper, Diskeeper Corporation
8. Active VirusScan, McAfee Inc.
9. Etrust, CA, Inc
10. OfficeScan, Trend Micro

Top 10 list taken from a 3 month span of unit sales, from November 2006 through January 2007.

* North American Product ranking and market share are based on unit sales.  All the data comes from National Purchase Diary (NPD) distribution channel software sales report.  NPD captures 88% of all sales going through distribution channels.