Thunderbird Will Not Delete RSS Folders
By default, Thunderbird creates separate folders for every RSS feed to which you subscribe. You can combine feeds into the same folder if you want. If you no longer wish to subscribe to a feed, you can use the Manage Subscriptions dialog box to remove the feed. However, you cannot delete the feed's folder from there. You have to delete folders from the main Thunderbird interface screen.
Instructions
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1
Click the "+" sign next to "Blogs and News Feeds" in the Thunderbird folder list on the left of the screen to view a list of all RSS feed folders.
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2
Right-click the name of the folder you want to delete, then select "Delete" in the menu. This moves the folder to Trash folder.
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3
Click the "Trash" folder to expand it.
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Right-click on the name of the folder you want to delete. Click "Delete" to permanently remove the folder.
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