Reposting from Aaron Guilmette's blog post here : https://blogs.technet.microsoft.com/undocumentedfeatures/2017/11/27/office-365-administration-inside-out-2/
Hey! It's finally here! After months of hard work (almost a year from when we started until a copy at my doorstep), we've finally made it to the finish line!
Or jump straight to Amazon and order it: http://aka.ms/o365adminio
While you're at it, be sure to check out the blogs of the other authors, filled with all sorts of goodies:
Darryl Kegg, https://aka.ms/dkeggblog
Aaron Guilmette, https://blogs.technet.microsoft.com/undocumentedfeatures/
Lou Mandich, http://blogs.technet.com/b/loum/