I use Mozilla Thunderbird on both Windows XP (Home, SP2) and Linux (Kubuntu Gutsy currently, will be upgrading to Kubuntu-KDE4 Hardy soon) to read my email using GMail's IMAP/SMTP access. This works fine, but I wish there was a way I could get both OSs to store the Thunderbird configuration and mailboxes in the same location. I tried this years ago with Dapper but never got it working. (I think Thunderbird just overwrote the files each time I ran it on either OS.)
If this isn't possible, is it possible to copy over the settings for an email account from one OS to the other? Basically, I'm asking if the files are in the same format and if the difference between line endings (i.e. LF or CR+LF) will mess it up.