When I import feeds from OPML, I can open the feed properties window ("Folder Properties"), but the only text data I can see is "Name" (taken from "text" or "title") and "Location" (assigned to the feed by the application, and looks like `mailbox://nobody@Feeds/Google Alerts. 941f2f87`). So the feed properties do not have the feed address (xmlUrl), which would allow it to be uniquely identified with feeds in the OPML file, feeds in another aggregator application, or with the Google Alerts interface. Also, when importing, the htmlUrl address, which is used to specify the address of the web interface for managing feeds (useless information for the application, but sometimes useful to the user), seems to be lost.

Also, as far as I understand, Thunderbird does not provide the user with the ability to see the date a feed was added to the application (or filter or sort feeds by this property), or an error log when updating it. Is this correct?