Use notmuch with thunderbird ?

[Stu]

Hi all,
   I use thunderbird to download mail from gmail with imap... this appears
in

.thunderbird/ckw5sbm3.default/ImapMail/imap.googlemail.com/[Google Mail].sbd


All Mail      Bin      Drafts      Important      Sent Mail      Spam
 Starred
All Mail.msf  Bin.msf  Drafts.msf  Important.msf  Sent Mail.msf  Spam.msf
 Starred.msf


I'm guessing these are all mbox files - is it safe to use notmuch with
these ?
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