Yeah, this one is a royal pain. Mozilla removes support for older versions of their browser six months after the new one went into production. Open source is nimble. Proprietary companies are inflexible. Sounds like its time to go after nimble applications?

Why Mozilla still hasn’t cracked the enterprise | May 24, 2006 07:12 PM | By Matt Asay

[A] hurdle Firefox must overcome is the “heartbreakingly slow” process many enterprises go through to certify the use of a tool as critical as a Web browser, according to Baker.