Why are there so many O365 plans? Right now we subscribe to the Office 365 Business + Azure Information Protection Plan 1 + Exchange Online (Plan 2). We need the Office plan for office of course, the AIP for message encryption, and exchange plan 2 for email and DLP. Now I would like to add Office 365 Advanced Threat Protection for the advanced phishing / anti-spoof which I guess I can just buy on it's own. I thought maybe I would find a plan that has everything I need in it that isn't E5, but no.. no it doesn't exist. E1 seems pointless, I would go with g-suite before I would do that, no fat clients included. E3 is missing parts of email security and wtf is MS 365? Did we really need another plan that had 365 in the name? Also why is there a proplus and business premium? For some reason I need one of the alternate versions of Outlook so that DLP tooltips can be displayed on the outlook fat client instead of the one that comes with Business. Hallelujah! Holy shit, where's the Tylenol? 