Microsoft is also announcing several Office 365 for Education customers, including Dartmouth College, which will roll out the suite for 10,000 students, faculty and staff; Cornell University, which plans to deploy it in the fall for 7,000 faculty and staff; the Fresno Unified School District, which will adopt Exchange Online for 74,000 students and 12,000 faculty and staff; and Gonzaga University, where 8,000 students and 1,200 faculty and staff will get access to the suite.

In May, Microsoft announced that about 4.5 million Catholic school students will get access to Office 365 for Education as part of a three-year deal the software vendor struck with the Catholic International Education Office (OIEC). The deal's scope could later be expanded to include all 43 million students at 210,000 Catholic schools in 102 countries.

At Dartmouth, Office 365 for Education is replacing an in-house email system deployed in 1988 and called Blitz. "It really fell behind the commercially developed systems," said Dartmouth CIO and Vice President of IT Ellen J. Waite-Franzen.

Dartmouth, which also uses on-premise Exchange servers for some users' email, began piloting Office 365 about a year ago and has worked closely with Microsoft as a tester.

The college expects to finish its Office 365 migration by the end of August, and Waite-Franzen expects that in addition to email and calendar, students and staffers will also adopt Lync and SharePoint.