Rated 5 out of 5 stars
OK :) But why it do not work with RSS-accounts?
Rated 3 out of 5 stars
How can I use it - do not understand?
Where is it options?
How do it work and when?
Go to Account Settings->Archive settings and choose age of messages to archive. Thunderbird will archive messages automatically after next restart and every 24 hours in the case if you do not close Thunderbird.