Thunderbird, Portable Edition Legacy 91

Thunderbird® Portable Edition Legacy 91 is the final releases of the 91.x branch of the Thunderbird email client. It is intended for groups who deploy and maintain the desktop environment in large organizations such as universities and other schools, county or city governments and businesses and the developers who support them. Individual users should use standard Thunderbird, Portable Edition. Thunderbird is the safe, fast email client that's easy to use. It has lots of great features including quick message search, customizable views, support for IMAP/POP, RSS support and more. Plus, the portable version leaves no personal information behind on the machine you run it on, so you can take your email and address book with you wherever you go.