I'm midst of planning to migrate Lync 2013 to Microsoft Teams with Direct Routing. During this pandemic, we have subscribe o365 to allows user use SharePoint, Teams, Group and One Drive. At this moment we didn't have AD Connect to sync between on-premises to cloud. and user is sign in to Teams and Lync 2013 using different email address. We plan to move all the user to Teams with direct routing in 1 shot without having half in on-premises and half in cloud.
Exchange hybrid (to allow user integrate with calendar in teams)
Exchange on-premise (mailbox is remained in on-premise)
AD connect (to sync user with cloud and on-premise)
Lync 2013 hybrid (to move user to cloud)
My Question is :
1. If we sync user via AD Connect , and move user to Teams. is user able to login as email@example.com and able to see their existing file, teams, group and conversation? previously they login teams as firstname.lastname@example.org. same as login to SharePoint and OneDrive.
2. Can we just turn off the Lync 2013 Server and Assigned license for Teams, SFB Online and Phone system and sign in to teams as email@example.com (because we don't have mix user on-premise or online)