[vthallam]

Not everyone is on Google Apps or Office 365. Most of the big corporations outside tech still use self hosted mail servers and use outlook client.

[djrogers]

This is changing - rapidly. Even some of the biggest companies in the uber-conservative oil and energy industries are moving to O365 and similar.

There are very few holdouts that have no privileged corporate information in one SaaS or another - SFDC, github for enterprise, Workday, netsuite, etc...

[7ewis]

Currently use Google, SFDC, GHE and Workday. NetSuite may be coming soon, we're very much so in the cloud!