1 - Keeping topics fresh and to the point enhances the groups.io Message Search function.
2 - I lock my group topics after 20 days. (By the end of 10-15 responses, almost every thread gets hijacked to a different topic.
3 - groups.io provides a number of ways to access messages, including digests, emails and online and they do work differently.
Larry
AC9OX
Larry McElhiney