Just configured NewsTap to work with old use.net. Some time saving tips for others:

  1. NewsTap cannot properly display an article's date prior to the year 2000.
  2. Disable delete read articles in the server configuration.
  3. Change the max age for articles for each use.net group to a number predating Usenet's existence. I chose 40 years, or 14600 days.

Some of this info is undoubtedly helpful when configurng other clients as well.