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Thunderbird will download all the data again.

But if the file is corrupt, it’s a good way to “reset”. This is one of the most common causes for Thunderbird to redownload your emails from the servers again and again. Because the information in popstate.dat file is corrupt and Thunderbird doesn’t know that it has already downloaded.ĭeleting this file will make Thunderbird lose all records of messages that has downloaded. If this file is corrupt, you can imagine the problems client can face to get data. Like downloading only headers, leave emails on servers or delete them, recover deleted messages from the servers and download them locally, and so on. It stores other information that Thunderbird requires to download data from servers. It’s a file Thunderbird uses to store the information about downloaded messages from the servers in POP account. But don’t worry, here are few methods you can try to solve this issue: #1: Delete popstate.dat file But after a day or two, it repeats the process again.

So, what happens most of the times is that Thunderbird, for some reason, thinks that it has never downloaded the data from the servers. POP on the other hand just downloads the data from the servers to a local database, in this case, to a Thunderbird’s local database directory. Whatever changes you make in IMAP account gets synced in both directions.

It is basically a syncing protocol that keeps your local database and server database in sync. IMAP downloads emails from servers while keeping the items secured on servers too. It happens with the POP3 email account, not with IMAP because of their inherent differences. There’s a weird glitch that frequently happens with many users when Thunderbird keeps downloading all your emails again and again. Methods – How to Stop Thunderbird from Redownloading all emails How to Stop Thunderbird from Redownloading all Emails from The Servers Again and Again.