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Random old emails getting marked as new/unread

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Every now and then, Thunderbird notifies me of "new" emails in my inbox that are actually week/month old. I have no idea why this is happening nor how to make it stop and it is really getting annoying.

Mozilla Thunderbird is up to date, I am using Microsoft Hotmail for my two accounts and my ISP is Bell Canada.

Thanks in advance

Every now and then, Thunderbird notifies me of "new" emails in my inbox that are actually week/month old. I have no idea why this is happening nor how to make it stop and it is really getting annoying. Mozilla Thunderbird is up to date, I am using Microsoft Hotmail for my two accounts and my ISP is Bell Canada. Thanks in advance

All Replies (3)

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first off, housekeeping.

File menu (Alt+F) > compact Folders

See if that helps? Maybe yes, maybe no.

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Already tried that, didn't work.

Modified by JohnnyTheWolf

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I am still experiencing the same problem. I have tried compacting my folders again and again, to no avail.