I had been a non-conformist in many ways with regard to installing my own tarball of Thunderbird and Firefox instead of using the packaged RPMs Fedora already built. I mainly did this because they are considered stable by Mozilla yet one version ahead of RPMs.
Late last year I had run into problems with my system dieing for various reasons and I had suspected Firefox. I knelt down and installed the RPM leaving the tarball version in place and changing my app links to point to the correct bin. Soon to follow was Thunderbird as well.
My family computer is the second Dell we have had with XP Home for the kids gaming entertainment and dual booting Linux mainly for my doing the books. Under XP we have used open source applications for the most part: Firefox, Thunderbird, OpenOffice.org. So off to a great start for migration.
Prior to allowing kids to play on the computer my wife had been using Linux with our first Dell. Then she just stuck with XP instead of having to keep rebooting for the kids. They had acquired many educational and gaming CD's over the years.