I'm running this on 1.7.2 with no issues. Members that haven't been on in the time I set receive an email to their registered email account. I use this as advance notification of pending suspension using the "Auto User Purge" plugin. Both together are a great way to get members to come back, and keep the site clear of inactive profiles if they don't. I love all of this developers work. The support is always polite, and helpful.