Non-Microsoft Security Applications
Non-Microsoft firewall, filtering, and antivirus products might not function properly in this release of "Longhorn" versions of Windows. Products known to have issues include the following:

BlackICE PC Protection 3.6 CRJ
eTrust EZ Antivirus 2005 6.2
eTrust EZ Armor 2005 2.3
F-Secure Antivirus Client Security 5.52
MacAfee Personal Firewall Plus 2004
Norton SystemWorks Professional 2004
Panda Titanium Antivirus 2004
Symantec Antivirus Corporate Edition 9.0
Trend Micro PC-cillin Internet Security 2004
ZoneAlarm Security Suite 5.0.590.043

Other products might also be affected.

Check with your non-Microsoft software vendors for updated versions of their products.