I will be writing about installing a complete Azure AD solution. This requirements are
- Install an Azure AD Connector to a forest
- Add an additional forest to the Connector
- Install a failover or backup
- There is no password write back
- There is no Exchange hybrid
- Selective OUs will be synchronized.
- ObjectGuid will be used as the anchor.
- The two directories use different Mail systems and share information currently so mail users in AD1 have contacts in AD2. These two identities should be joined together using the mail attribute.
A diagram will look like this
There are 3 steps