Unread folders contain no unread messages

User Help for Mozilla Thunderbird
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Joined: December 13th, 2007, 9:43 am

Post Posted January 10th, 2017, 4:03 pm

Running TB v45.6.0 on Win10. I have set View > Folders > Unread to only see unread folders listed. Works as advertised with one exception - when I select a listed unread folder and open the unread message(s) - the folder is still listed as unread!

Is this a known TB problem? Anyone else observe this behavior? Thx, Rob


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Post Posted January 10th, 2017, 4:08 pm

Do you regularly compact the message folders? Compacting is something that needs to be done regularly in any email program, particularly with POP type accounts. We recommend weekly, but many of us do it daily. When done often enough, it can be an extremely fast process. Not doing so can lead to problems like those you are experiencing. See this about how to and why it's so important:

If you haven't been doing that before, first back up your Thunderbird Profile -- then compact all folders. If 'compacting' them (and leaving a long enough time for the process to complete) doesn't fully resolve the problem then do the following on each account:

Close Thunderbird. Find and delete all of the files with the .msf file extension in your profile folder/Mail including your Local Folders, especially if you are using the global inbox. You must have "View hidden files and folders" on and you need to set "hide extensions for known file types" off (just below View Hidden) if you are using Windows. These are your mail summary files and do not hold any messages themselves. They will be rebuilt the next time you open each folder in Thunderbird. Compact all your folders when you have completed this.

To avoid this happening again, see the tips in these articles: ... derbird%29

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