Administer and support Exchange Server 2016, Exchange Server 2019, Exchange Server Subscription Edition, and Exchange Online, including Database Availability Groups, transport services, certificates, cumulative updates, security updates, and high-availability configurations. Design, implement, configure, and maintain multi-domain and multi-forest Microsoft Active Directory Domain Services infrastructure, including trusts, Flexible Single Master Operations roles, domain controller lifecycle management, schema changes, functional-level upgrades, and disaster recovery.