As with most Microsoft applications, after the forest is prepared, the domain must be prepared. Important to note is that the steps domain prep performs are different from those in forest prep. So even if a forest is comprised of a single domain, it is necessary to perform both tasks. Domain prep should be performed on all domains that host Lync Server users or servers.
1. Click Run on Step 5: Prepare Current Domain.
2. When the commands are executed, click Finish.
3. Verify replication of the Access Control Entries set by Domain Prep, and then click Exit. This will return you to the Deployment Wizard, as shown in Figure 10.4.