Another enhancement to Office 365 Groups is rolling out.....groups can now have up to 100 owners!
Previously, an Office 365 Group could have no more than 10 owners. This limit has been increased to 100. A limit of 100 owners is now supported in Azure Active Directory, Office Admin Portal, and Exchange Admin Center, with support in OWA rolling out soon. Additionally, Distribution Lists that were previously ineligible for upgrade to Office 365 Groups due to the owner limit are now eligible.
We're excited to deploy this change which will help support several of our large customers as well as newly integrated services with more distributed ownership models.