This old standard doesn't support the way business is done today. To meet users’ basic requirements, businesses these days require 24/7 email uptime, complete mobile freedom, a half-dozen adjacent technologies, and protection against unprecedented levels of threat.
This is why email solutions are moving to the cloud: a cloud email provider can offer far more functionality, reliability, and protection than you could affordably deliver on-premises.
But not all clouds are created equal. Office 365 is the best example: while it does address the shortcomings of the old on-premises server and meets the needs of the most cost-sensitive businesses, it doesn't address the requirements of the New Standard.
Here's what you need to meet The New Standard.