Background: I'm switching email providers from Yahoo to Gmail. I'm using Thunderbird to drag and drop email from my old account and upload them to the new gmail account. I'm copying a large number of files as I need to keep 3-years of email for work, and I use the copies stored on the server as my backup in case my computer is stolen etc. Problem: Thunderbird starts uploading a batch of messages. It runs fine for a while, saying "copying message x of x" until it encounters a message with an attachment. It then says "sending authenticate login information" for a while, then a "connection timed out" error pops up and it stops uploading. Can anyone advise? Can I increase the timeout time somehow? Would that even help? Cheers, Adam