mozbackup works great but I do not know how it handles existing mail.
If not to much u could forward those to yourself first.
fp
At 05:26 AM 7/23/2012, Thane Sherrington Poked the stick with:
Is there a way to import mail from one computer to another in
Thunderbird? Normally I'd just copy the profile, but the new
computer has been used for several days so there's already email in
it, and I don't want to lose that email.
T
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Tallyho ! ]:8)
Taglines below !
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"Democracy is two wolves and a lamb voting on what to have for lunch.
"Liberty is a well-armed lamb contesting the vote."
-Benjamin Franklin, 1759