If you like holding onto your Thunderbird RSS feeds like I do, the folders can become very large. These steps will walk you through clearing out your RSS folders, so you have a fresh start, at least from the point of having the folders cleared out.
After you do this once or twice, it should should be fairly quick for you after that. I usually do this maybe every 2 months, but I do have a large number of feeds, and one alone has 2000+ articles in it. Although I didn't count then all, one time in the past, I had about 15,000 articles when I cleared it.
1. Find location of your feeds:
1.1. Open Thunderbird.
1.2. In the left column, click on "Blogs & News Feeds".
1.4. In the right column, click on "View Settings for this account".
1.5. Make note of the location in "Local directory".
2. Disable all internet access.
2.1. This is needed to insure that no checks happen while you're performing these steps.
3. Open Thunderbird.
4. In the left column, click on "Blogs & News Feeds".
5. Expand all folders in the left column.
6. Select all folders in the left column.
7. Right click in left column.
8. Click Mark All Folders read.
9. In the right column, click on "Manage subscriptions".
10. Click on "Export".
11. Navigate to desktop.
12. Click Save.
13. Click Close.
14. Open Windows Explorer.
15. Navigate to the location in step 1.5.
16. Delete all files and folders under the "Feeds" folder, but not the "Feeds" folder.
16.1. This deletes all the feeds. But the "export" you did above, will bring the feeds back in.
17. Start Thunderbird.
18. In the left column, click on "Blogs & News Feeds".
19. In the right column, click on "Manage subscriptions".
20. Click on "Import".
21. Navigate to desktop.
22. Click on the file saved in step 12.
22.1. This will import your feeds.
23. Re-enable your Internet access disabled in step 2.
24. Initiate a check of your feeds.
Have a great day!
Edited by scotty_ncc1701, 11 August 2014 - 05:29 PM.