Installing Skype for Business – Part 2

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In this second Tutorial, we are going to prepare the Active Directory to support Skype for Business Server 2015 and as part of the process we will be preparing Schema, Forest and domain.


The Active Directory preparation has a a full page containing 7 (seven) steps to prepare the Active Directory. The first step is to prepare the Schema, and to get that going we will click on Run located on Step 1: Prepare Schema.


Preparing the Schema..

The Schema preparation is a straight process, however there are a few requirements that must be validated, as follows:

  • The user that is running the process must be member of the Schema Admins in Active Directory
  • Make sure that your Active Directory replication is working properly
  • Since we are changing the Schema a backup of your Active Directory is highly recommended
  • In order to check if the current user is part of Schema Admins, we can run the following command
    net user <username> /domain
  • The Domain Controller with the FSMO role of Schema Master must be operational
  • In order to check which Domain Controller has the Schema Master FSMO role, the following command can be used:
    netdom query fsmo

Now that we checked the process we just need to click on Next and on the next screen we will have the results of the Schema preparation process, we can always check the logs in case of any errors. If everything went well, just click Finish.


In order to validate the Schema, the ADSIEdit.msc can be used, add the Schema partition and locate the CN-ms-RTC-SIP-SchemaVersion object, and get properties, in the properties page locate the attributes rangelower and rangerUpper and they should have the values 3 and 1150 respectively.


Preparing the Forest…

After completing the Schema preparation, we can click on Run located on Step 3: Prepare Current Forest to start the Forest preparation. In order to prepare the forest make sure that these following conditions are met:

  • The user that is running the process is part of the Enterprise Admins group in Active Directory
  • The current computer is part of the root domain in your forest (if you have a single domain, then you are fine)
  • The Active Directory Forest and Domain functional level must be at least 2003


In the initial page, click on Next to start the process.


In the Universal Group Location page. We need to define where the Universal Groups will be created, since we have a single domain we will leave default settings, after deciding on your environment click Next.

Note: These are the groups that will be responsible to delegate the pre-defined roles in Skype for Business environment


In the final page we will the output of the process, if everything went well just click on Finish. If there is an error the administrator can check the output and also click on View Log to get more information on the issue.


In order to validate if the process was successful, open Skype for Business Server Management Shell and run Get-CSADForest cmdlet, the expected result is LC_FORESTSETTINGS_STATE_READY, as shown in the image below.


Preparing the domain…

In order to prepare the domain these following conditions must be met in your environment:

  • Replication from the previous changes must be in place
  • The account running the process must be Domain Admins
  • The Active Directory Forest and Domain functional level must be at least 2003

If everything is okay, click on Run located at Step 5: Prepare Current Domain.


Like the previous preparation process that we have done so far, just click Next.


In the Executing Commands page. Check the results, and if everything went well, just click on Finish.


The proper way to test the results of the domain preparation is running the Get-CSADDomain cmdlet using Skype for Business Server Management Shell, and the expected result is LC_DOMAINSETTINGS_STATE_READY.


Defining the Skype for Business Server administrators…

The final step of the Active Directory preparation is assigning which accounts will be the administrator of the new Skype for Business environment that we are building.

O passo 7 é adicionar os usuários que serão administradores do Skype for Business Server 2015, e este processo é manual.


There are several ways to accomplish this task, the easy one is using Active Directory Users and Computers, and adding the desired users to the CSAdministrator group (the group is located under Users container). In our Tutorial series we are going to add just the administrator account for now.


After completing all the first steps, we are ready for the next steps. The results of this Tutorial can be seen on the Active Directory Preparation page of the Deployment Wizard where all tasks show up as Complete.


In order to check the entire process from the main article, please use the first article of this series:

Written by Anderson Patricio

Anderson Patricio

Anderson Patricio is a Canadian MVP in Cloud and Datacenter Management, and Office Server and Services, besides the Microsoft Award he also holds a Solutions Master (MCSM) in Exchange and several other certifications. Anderson has been contributing to the Microsoft Community with articles, tutorials, blog posts, twitter, forums and book reviews. He is a regular contributor here at,, and Anderson (Portuguese).

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