Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2013, and then click Lync Server Management Shell.

Do any of the following:

• To enable unified contact store globally for all Lync Server users, at the command line, type:

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  Set-CsUserServicesPolicy -Identity global -UcsAllowed $True

• To enable unified contact store for the users at a specific site, at the command line, type:

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  New-CsUserServicesPolicy -Identity site:<site name> -UcsAllowed $True

  For example:

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  New-CsUserServicesPolicy -Identity site:Redmond -UcsAllowed $True

• To enable unified contact store by tenant, at the command line, type:

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  Set-CsUserServicesPolicy -Tenant <tenantId> -UcsAllowed $True

  For example:

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  Set-CsUserServicesPolicy -Tenant "38aad667-af54-4397-aaa7-e94c79ec2308" -UcsAllowed $True

• To enable unified contact store for specific users, at the command line, type:

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  New-CsUserServicesPolicy -Identity "<policy name>" -UcsAllowed $True Grant-CsUserServicesPolicy -Identity "<user display name>" -PolicyName <"policy name">

  Note:
  You can also use user alias or SIP URI instead of the user display name.

  For example:

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  New-CsUserServicesPolicy -Identity "UCS Enabled Users" -UcsAllowed $True Grant-CsUserServicesPolicy -Identity "Ken Myer" -PolicyName "UCS Enabled Users"

  Note:
  In the preceding example, the first command creates a new per-user policy named UCS Enabled Users with the UcsAllowed flag set to True. The second command assigns the policy to the user with the display name Ken Myer, which means that Ken Myer is now enabled for unified contact store.