As a common practice, wrong or not, people at work have been creating Security Groups in AD and then mail-enabling those, which were being used in Exchange 2013.
I've heard that there is no way to migrate those to Office 365? So my question is, is it true that they cannot be migrated (we're in a Hybrid environment now) and what steps need to be taken to get those to Office 365 as Distribution Groups?
Thanks in advance.