Eddie, "inactive for 12 months" means the member has not logged in to his account for 12 months.
Quite distinct from that requirement is the requirement to maintain an average of at least one post per month of membership. This number is cumulative, so, for instance, it is possible to post say 20 messages on the day of joining. That would cover the post requirement for 20 months. But if no more messages were posted and the member did not log into his account again, then the account would be liable to be deleted after 12 months.
2010 Stephen Eden spruce/cocobolo classical guitar
2012 Stephen Eden cedar/IRW classical guitar