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Multiple downloads of same emails after latest W 10 updates today (Nov 1 -2019))

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W 10 updated today. Now Tbird downloads messages repeatedly. Never happened before. I reinstalled version 68.2.2 of Thunderbird - set account to POP (so that it will not delete emails on computer if I delete them on the server) -which is how I had it before. Replaced popstate.dat.file. Repaired inbox. No change after a day of trying. It still downloads all messages from the server inbox each time. I also notice that although I have set up filters to sort messages on the inbox these keep disappearing. Either W 10 did Thunderbird in or somehow one or more parts of the system have been corrupted. I have the Thunderbird profile on a separate hard drive as it has been for well over a decade without any issues. I am out of ideas and v frustrated. Help appreciated.

W 10 updated today. Now Tbird downloads messages repeatedly. Never happened before. I reinstalled version 68.2.2 of Thunderbird - set account to POP (so that it will not delete emails on computer if I delete them on the server) -which is how I had it before. Replaced popstate.dat.file. Repaired inbox. No change after a day of trying. It still downloads all messages from the server inbox each time. I also notice that although I have set up filters to sort messages on the inbox these keep disappearing. Either W 10 did Thunderbird in or somehow one or more parts of the system have been corrupted. I have the Thunderbird profile on a separate hard drive as it has been for well over a decade without any issues. I am out of ideas and v frustrated. Help appreciated.
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Do you mean you are seeing duplicates in the Inbox or is the Inbox empty if you start up Thunderbird in offline mode? Do you see extra 'popstate.dat' files in profile; some with a number? Is the 'popstate.dat' file set as 'read-only' in it's 'Properties'?

Do you use an Anti-Virus product or CCleaner and is it scanning Thunderbird profile on other drive?


In default location (not where you have profile) 'Thunderbird' folder, there will be 'profiles.ini' file. C:\Users\<Windows user name>\AppData\Roaming\Thunderbird Open 'profiles.ini' with Notepad and post image showing contents.

In the usual default location where Thunderbird normally creates profiles, is there a default profile that has that pop mail account in it? C:\Users\<Windows user name>\AppData\Roaming\Thunderbird\Profiles\<Profile name>\ Mail\pop mail account name


Test: Start computer in 'Safe Mode with Networking', then start Thunderbird and report on results.