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why are some of my folders blue and some black?

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On the left of Thunderbird is a list of user accounts and folders. Some of these are blue and some are black. Why is that? What does it take to turn an account or folder to blue from black?

On the left of Thunderbird is a list of user accounts and folders. Some of these are blue and some are black. Why is that? What does it take to turn an account or folder to blue from black?

Chosen solution

The blue indicates a new unread message. Once you open the folder to view the headers it changes to bold black until you read the messages.

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Suluhisho teule

The blue indicates a new unread message. Once you open the folder to view the headers it changes to bold black until you read the messages.