- AlwaysOn Availability Groups
Nope – You can use failover groups and active geo-replication instead of AG groups.
- Linked servers
Nope – You can use Elastic query instead of linked servers.
- Event notifications
Nope – You can use alerts instead of the backup command.
This list was taken from Azure SQL Database features 9/22/2017.
Watch for updates as features are added or replaced with alternatives.