Checkpoint:
http://checkpoint-master-architect.blogspot.de/
Valeri Loukine blog about Check Point, Tufin and Mac OSX.
https://community.checkpoint.com/
Checkpoint Checkmates forum
Microsoft:
https://www.petri.com/
Petri has contributed to the Microsoft community for several years. If it has ever been made or configured, chances are that petri has made a post about it.
Other bookmarks: