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In the shortest answer, just replace the Profile folder of the New account with the Profile folder of the Old account.<br />
<br />
That will move all preferences and settings and emails and address book, but you may have to modify a .ini file.<br />
<br />
But this page will give you more precise information.<br />
<a href="http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Thunderbird" rel="ugc">http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Thunderbird</a>
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keks_<br />
<br />
Did you need more info or any more questions regarding this?
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Yes, thanks. I copied all the Profile files over but when I run Thunderbird it doesn't detect anything. It's just a blank install.<br />
<br />
Any modifications I need to make?
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I will try it tomorrow at the office. But thanks for such a detailed answer!
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I have a lot of messages saved in the default Thunderbird format (mbox files and msf files) and would like to move them to a new Thunderbird installation. <br />
<br />
How can I do that?<br />
<br />
Thanks!
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I have a lot of messages saved in the default Thunderbird format (mbox files and msf files) and would like to move them to a new Thunderbird installation. 

How can I do that?

Thanks!

In the shortest answer, just replace the Profile folder of the New account with the Profile folder of the Old account.

That will move all preferences and settings and emails and address book, but you may have to modify a .ini file.

But this page will give you more precise information.
http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Thunderbird

keks_

Did you need more info or any more questions regarding this?

Yes, thanks. I copied all the Profile files over but when I run Thunderbird it doesn&#39;t detect anything. It&#39;s just a blank install.

Any modifications I need to make?

I will try it tomorrow at the office. But thanks for such a detailed answer!

How to import old messages from an old install of Thunderbird to a new one?

Thunderbird is an email, newsgroup, news feed, and chat (XMPP, IRC, Twitter) client that supports POP and IMAP and LDAP address completion. The vanilla version is not a personal information manager, although the Mozilla Lightning extension adds PIM functionality. Thunderbird can manage multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts. Features such as quick search, saved search folders, advanced message filtering, message grouping, and labels help manage and find messages. Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin. Extensions allow the addition of features.

Thunderbird

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.