On my version I already have two versions of English available for the spell checker. English English and American English (if there is such a thing).
I see that there are many more available. As for Thunderbird, there is an add on called lightning that tweaks it up quite nicely. OK on the Linux machine (my lappie) its all I need and it loads up really nice. There doesn´t seem to be anything that I can´t do that my Windows clunker can do. I have now relieved my home machine (XP) of MS Office and am happily using openoffice with no hindrance. One of the features I like about openoffice is the ability to export straight to a (as secure as you like) .PDF file.
If you love it, let it go. If it comes back to you, you've just high-sided!
مافي مشكلة
Bookmarks