As I recently wrote one of the current usable and possible solutions for search Linux based systems is tracker.
But I wasn’t aware of that the homepage is hopelessly outdated – first of all there were already new releases, the current version 0.5.1 was announced some days ago.
Also, and that was even more important to me: there are packages already included in Fedora Extras (at least for Fedora Core 6) – you can just install it with yum (ok, due to a current bug the best to install tracker-devel and catch tracker as a dependency and prevent mikmod from replacing tracker).
Also interesting is that this version comes along with a stand alone search tool – just launch
tracker-search-tool, and you will be able to search just like with beagle.
It is also said that tracker is now able to index kmail and thunderbird mails – however, this doesn’t work for me, I don’t know why… Anyhow, nice to have this program available so easily atm. I just hope they update their homepage soon.
I got a response about the indexing problem, it is currently deactivated, but they hope to have it back in a stable form around Christmas. Sounds good, would love to check how it indexes the mails.