I am pretty sure that if the mail is exported in Thunderbird, then it 
can be imported into an imap account, but maybe not.
I didn't do all that when I switched over. I just left the pop3 account 
on the PC, but disabled it from sending and receiving.
Then set up a new imap account.
If I need to look at old mail, I just open up the pop3 account and look.
If need be, copy and pasting from old emails to new ones is how I do it.
On 2/17/2012 4:18 PM, Glenn Meadows wrote:
> OK, I've got the owner of the business here, who's been using POP3 
> FOREVER on all of his email clients. He has email access on 5 or 6 
> machines at this point, all running POP3, including his Android 
> Phone.  One machine is the master for controlling how long mail stays 
> on the server, and the others are set to LEAVE on the server. His main 
> problem, of course, is dealing with sent messages from the various 
> machines.  Ergo, the desire to migrate him from POP3 to IMAP.  The big 
> question is HOW do we get all the POP3 email that's on the main 
> system, back to the server and into his massive collection of sub 
> folders?  And, all under the same email address.
>
> He uses Thunderbird for his email client, although we'll probably move 
> his account over to Chaos Software Intellect, which is a full 
> Contact/Scheduling system, that has a full Email Client in it, that 
> links email sent/received to contacts.  Call up the contact name, 
> click the Email Tab, and all the email to/from the client is linked 
> there and click accessible.
>
> Anyway, the issue is how to move the POP3 stuff into the IMAP version 
> of his account.
>
> I THINK I've got to FIRST create all of the appropriate folders in the 
> SurgeWeb version of his email account, so that when we convert the 
> account to IMAP, the matching folders will be there.
>
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