The Summer Priorities 2025 presentation provides a comprehensive, task‑driven roadmap for strengthening district and organizational IT environments during the summer maintenance window. The guidance spans cybersecurity hardening, infrastructure maintenance, disaster recovery preparation, and operational cleanup.

This is an excellent article from Microsoft TechNet on the navigating complexities of DNS scavenging.   DNS scavenging is a means of helping DNS clean up after itself.  https://blogs.technet.com/b/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.