03-15-2018 11:11 AM
03-15-2018 11:36 AM
Depends on what you mean by versions. The Email app usage report will give you some info: https://portal.office.com/adminportal/home#/reportsUsage/EmailClients
If you want actual version/build numbers, the only way to gather such data is from the audit logs, one entry at a time.
by Sonal Pardeshi on May 31, 2017