Next is a period-asterisk combo that indicates that any number of characters up to the end of the line can occupy some space, including zero characters. If you look at the bold line I quoted above that it is looking for, you can see the pattern matching steps. You must customize the pattern for your list's headers. Not all mailing lists are configured the same. The third line is the actual filename that procmail will put the email into.
Case is important, so get it right.
I converted all spaces to underscores and renamed all the old Netscape folders. It's up to you. The added complexity of quoting everything with spaces just didn't appeal to me. Repeat the above step for each folder that exists in Netscape. Do not make one for Drafts, Templates, Unsent, and Deleted.