Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2

Topic Last Modified: 2012-07-23

When Outlook Voice Access users dial in to a subscriber access number, they're prompted to enter their PIN so that the Unified Messaging (UM) system in Microsoft Exchange Server 2010 can authenticate them. After they're authenticated, they can access the voice mail, e-mail, calendaring, and personal contact information in their Exchange 2007 mailbox from any telephone.

Several PIN-related settings can be configured on a UM mailbox policy. The Number of previous PINs to disallow setting specifies the number of unique PINs users need to use before they can reuse an old PIN. You can set the value of this setting between 1 and 20. For most organizations, this value should be set to the default, 5 PINs.Setting this value too high can frustrate users because it can be difficult for users to create and memorize many PINs. Setting it too low may introduce a security threat to your network.

Important:
The PIN history can't be disabled.

Looking for other management tasks related to UM mailbox policies? Check out Managing UM Mailbox Policies.

Prerequisites

Use the EMC to change the number of previous PINs to disallow

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailbox policies" entry in the Unified Messaging Permissions topic.

  1. In the console tree, navigate to Organization Configuration > Unified Messaging.

  2. In the work pane, on the UM Mailbox Policies tab, select the UM mailbox policy you want to manage, and then click Properties in the action pane.

  3. On the UM mailbox policy Properties page, click the PIN Policies tab.

  4. On the PIN Policies tab, next to Number of previous PINs to disallow, enter a value between 1 and 20.

  5. Click OK to save your changes.

Use the Shell to change the number of previous PINs to disallow

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailbox policies" entry in the Unified Messaging Permissions topic.

This example sets the PIN history on the UM mailbox policy MyUMMailboxPolicy to 10.

Copy Code 
Set-UMMailboxPolicy -Identity MyUMMailboxPolicy -PINHistoryCount 10

For more information about syntax and parameters, see Set-UMMailboxPolicy.

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