Thunderbird displays only the message count of unread mails of every folder by default. I tried to find a way to display the count of all messages instead which would help me get an overview of the amount of mails stored inside a folder.
I wanted to make sure that the unread messages number would still be shown as well. Showing both the read and unread email count can be done in Thunderbird, read out to find out how.
The option to activate the message count for all mails is kinda hidden in Thunderbird. You need to enable the "Show Expanded Columns" option first which can be done by going to Tools > Options, selecting the Advanced tab and checking "Show Expanded Columns in the Folder Pane".
When that is done click on the small icon next to Name in the folder pane and select total from the drop down menu. Once that is done you see the total amount of mails that are currently in the folder. It does however not display the number of mails that are in sub folders unless you expand them first.
I have not found a way to enable mail count that includes the sub folders by default.
Update: It appears as if Mozilla has removed the capabilities in recent versions of the email client. The setting is no longer listed under advanced, which indicates that it may have been removed by the developers. It is not clear why this has been done, but it means that you cannot display both the unread and read messages of each folder in the program anymore.
We tried to find another solution, like an extension or advanced configuration that you find under Tools > Options > Advanced > General > Config Editor but could not find one. It is not likely that the setting will be added in a later version of Thunderbird again.
Update 2: You can install the Extra Folder Columns extension for Thunderbird to bring back the functionality. Once installed, it displays the number of unread messages, the total number of messages, and the total size of the folder in the folder sidebar.
You can click on the configuration icon next to size in the header and disable the items that you do not want to display here.
The Extra Folder Columns extension for Thunderbird adds a much needed feature to the email client. You can now not only see how large each individual folder is, but also how many emails it contains.
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