Comodo Personal Authentication Certificates (CPACs) allow you to add security to your emails and documents and help you authenticate yourself to online services.
Server and Client OS Compatibility
Client OS: Mac OS X, Snow Leopard, Windows 7, Vista, Xp, 2000, Linux Client OS.
Server OS: Windows Server 2008, 2003, 2000, Linux, UNIX, Solaris, Novell, etc.
Web Server: Microsoft IIS 7, IIS6, Apache, Tomcat, IBM HTTP, Weblogic, Cobalt.
E-Mail Servers: Netscape Communicator 4.51+,Microsoft Outlook 99+,Microsoft Entourage (OS/X),Mozilla Thunderbird 1.0+,Qualcomm Eudora 6.2+,Lotus Notes (6+), etc.