I am migrating all my email to a new server. I have about 10 accounts in 10 different folders in Mozilla Thunderbird. I have been using pop3 in the past, but on the new server I want to use imap.
I have created all the imap accounts on the new server and I want to copy over all the emails on their folders on Thunderbird to their corresponding imap account folders on the new server.
When searching for an answer for this, most people suggest just copying all the emails in their folder to the imap account inbox. Some people say that you should only copy around 500 emails at a time. The problem is I have around 20,000 emails per account (going back to the year 2002!) and Thunderbird just gives up on me. I have managed to get it working occassionally by copying 500 emails at a time but this is going to take forever!
Thunderbird shows that it is copying the emails with a message in the status bar, but after a short while the status message goes blank.
My question is, is there a way of moving a large number of emails from a local folder on Thunderbird to an imap account that works and is quick?