Is the hotmail account a Pop or IMAP mail account?

If Pop: The popstate.dat file keeps a record of everything that has been downloaded. It sounds like this file has gone awol.

see info:

• http://kb.mozillazine.org/Popstate.dat

You would need to delete the 'popstate.dat file and then Thunderbird will create a new one. The downside is that it will download everything that is on your server again, but just once.

• Close Thunderbird.
• Locate your Profile folders:
• http://kb.mozillazine.org/Profile_folder_-_Thunderbird

Then look in the \Profiles\xxxxxxxx.default\Mail\account name folder for 'popstate.dat', a DAT file.

• Delete the 'popstate.dat' file.
• Open Thunderbird.
• Click on GetMail.

Download will happen and you will need to sort through the mail. This should fix the popstate file so that it has an uncorrupted record of what has been downloaded.

If you like, you could use this addon to get rid of duplicates.

• https://addons.mozilla.org/en-us/thunderbird/addon/remove-duplicate-messages/

You can choose to 'Leave messages on the server' or not or remove when you delete.

'Tools' > 'Account Settings' > 'Sever Settings' for the mail account.

example:

• Select' Leave messges on the server'
• Select: 'For at most 32 days'
• Select: 'Until I delete them'
• click on OK

This will leave emails on the server for 32 days and then remove them or if you choose to delete an email it will be deleted prior to that date.

This combined with a monthy backup means you should be able to retrieve most if not all emails should you need to do so. It will keep the server low in emails and so you should not reach your server quota.

Hi, Your second solution is already set to delete the messages, mine set to 5 days.

Your first solution did not work. This is whats in the Popstate file:

1. POP3 State File
2. This is a generated file! Do not edit.

I did delete the file and restarted. I am still having the same problem.

If you deleted the popstate.dat file, it will download all the emails because you have just created a new popstate.dat file, but it should only do this once.

I deleted the POPSTATE file. I also deleted all the messages in hotmail.

I am still having the same problem that I am still receiving duplicate messages after doing the above.

Its been 48 hours since my last response. Is this item going to be corrected?

Is what going to be corrected? The fact that hotmail defaults to not allowing deletion of mails? I have a folder in my deleted called pop with thousands of mail I had Thunderbird delete over the years.

The fact that anti virus programs, particularly Norton's but others as well make such a mess of virus scanning that the chop off the connection so the popstate.dat file is not correctly updated at the end of the download.

Disable email scanning in whatever anti virus solutiuon you use. Check your setting on the outlook.com web site to be sure they are what you think they are. Reboot your computer.

Now do you still have an issue?

Yes the issue still remains. However, its not every email. I did change the anti-virus (Kaspersky) not to scan the email folder.

I did recheck my settings OUTLOOK. They are what I had set them to a year ago.

This started with the this version of Thunderbird.

If you're using POP, you could change to IMAP.

I had a similar problem recently and that's what I did, IMAP is much better. If you need help changing to IMAP check out the article below.

Switch from POP to IMAP account

This is not all emails, e.g. emails from The Register ALWAYS do this: they never delete and download repeatedly every time you do a POP. Only way to delete is to login to the web interface and delete from there. This only started early this year and I assumed that this would get fixed in the normal course but I see others are having the same problem.

Not sure whether the problem is Hotmail/Thunderbird or format of the email headers; here is header of one such email.

From - Thu Aug 07 11:06:15 2014 X-Account-Key: account3 X-UIDL: 8BC8AF60-1D9D-11E4-BD78-002264C1975E X-Mozilla-Status: 0001 X-Mozilla-Status2: 00000000 X-Mozilla-Keys: x-store-info:J++/JTCzmObr++wNraA4PbUEFQLiW8KjZFZKNHV9EaHdof0rgFQYDMcQvtb1VUC2F1Jh6mM/9t9DoUctBAylQh9cVYhuCDXB/cs1c85EYWqf7IhWBOQkrFC6qO5odi5CslN0gQu03CIRGL5gan0xNg== Authentication-Results: hotmail.com; spf=pass (sender IP is 92.52.96.119) smtp.mailfrom=update-609509-f547279f@list.theregister.co.uk; dkim=none header.d=list.theregister.co.uk; x-hmca=pass header.id=update-609509-f547279f@list.theregister.co.uk X-SID-PRA: update-609509-f547279f@list.theregister.co.uk X-AUTH-Result: PASS X-SID-Result: PASS X-Message-Status: n:n X-Message-Delivery: Vj0xLjE7dXM9MDtsPTE7YT0xO0Q9MTtHRD0xO1NDTD0w X-Message-Info: NhFq/7gR1vQlBhGkv9/yLRSX7Q0yqzfiZZkfl1N9a+rqVrtlg5x49Owx7rrFOyND6M7Q/ZoFruTjqw9LOpnVXTZQKvu2WEIRo1dZvuhhQqbV1X7b8A15WMXpjvBE6KkKgpeQdyIb/PwZGnXkn3hqmJNx4PPoxzw9XjkUYCevXfpwcOcEGqzpnfDRUKewi3kOprPn7KyXvjFQ7X2sjj7SGQ7TTqvWrFXT Received: from list.theregister.co.uk ([92.52.96.119]) by SNT004-MC4F3.hotmail.com over TLS secured channel with Microsoft SMTPSVC(7.5.7601.22712); Wed, 6 Aug 2014 12:12:10 -0700 Received: from localhost.localdomain ([127.0.0.1] helo=list.theregister.co.uk) by list.theregister.co.uk with esmtp (Exim 4.72) (envelope-from <update-609509-f547279f@list.theregister.co.uk>) id 1XF6Tf-00084H-SD for XXXX@hotmail.com; Wed, 06 Aug 2014 20:02:23 +0100 Message-Id: <E1XF6Tf-00084H-SD@list.theregister.co.uk> MIME-Version: 1.0 Content-Transfer-Encoding: binary Content-Type: multipart/alternative; boundary="_=_=_aa" X-Mailer: MIME::Lite 3.027 (F2.77; T1.30; A2.06; B3.08; Q3.08) Subject: Top Ten 802.11ac routers: Time for a Wi-Fi makeover? [Wed Aug 6 2014] X-Auto-Response-Suppress: OOF Date: Wed, 06 Aug 2014 20:02:23 +0100 List-Id: <list.theregister.co.uk> Precedence: list To: XXXX <XXXX@hotmail.com> From: The Register <update-609509-f547279f@list.theregister.co.uk> Return-Path: update-609509-f547279f@list.theregister.co.uk X-OriginalArrivalTime: 06 Aug 2014 19:12:10.0454 (UTC) FILETIME=[528CA760:01CFB1AA]

My guess is your anti virus program barfs on mail from the register and for reason best know to it drops the connection without doing the deletes etc. (Nortons had the following on their support site at one time)

Disable email scanning, download your mail and reenable email scanning. I must have linked to it to many times, so they took it down.