Windows Me
Windows 2000 Professional
Windows XP Professional, XP Home Edition
Windows Vista

Microsoft Internet Explorer 4.0 and above
Netscape Navigator/Communicator 4.0 and above
Netscape 6.0 and above
Microsoft Outlook Express (Coupled with MSIE)
Eudora 2.8 and above(include Pro)
Microsoft Outlook 2002, 2003, 2007
Becky! Internet Mail Ver.2
Mozilla Firefox 1.0 and above
Mozilla Thunderbird 1.0 and above
Windows Mail

Mac OS 7.5.1 - 9.2.x

TCP/IP 1.1.1 and above
MacTCP 2.0.6 and above
Netscape Navigator/Comunicator 4.0 and above
Netscape 6.0 and above
Microsoft Internet Explorer 4.0 and above
Microsoft Outlook Express 4.0 and above
Eudora 2.1.3 and above
Internet Config 1.2 and above

Mac OS X 10.0 and above
Microsoft Internet Explorer 5.1 Preview Release and above
Mail 1.0 and above (with system)
Netscape 6.2 and above
Safari 1.0 and above
Mozilla Firefox 1.0 and above
Mozilla Thunderbird 1.0 and above