Applies to: Exchange Server 2007 SP3, Exchange Server 2007 SP2, Exchange Server 2007 SP1, Exchange Server 2007
Topic Last Modified: 2007-08-18

This topic explains how to use the Exchange Management Console and the Exchange Management Shell to configure the Number of previous PINs to disallow setting for your Outlook Voice Access users. You configure the number of PINs to disallow on a UM mailbox policy. This number will apply to all UM-enabled users who are associated with the UM mailbox policy.

When Outlook Voice Access users dial in to a subscriber access number, they are prompted to enter their PIN so that the Microsoft Exchange Server 2007 Unified Messaging system can authenticate them. After they have been 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 that a user must 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.

The PIN history cannot be disabled.

Before You Begin

To perform the following procedures on a computer, the account you use must be delegated the Exchange Organization Administrators role.

For more information about permissions, delegating roles, and the rights that are required to administer Exchange 2007, see Permission Considerations.

Also, before you perform these procedures, confirm the following:

  • A UM dial plan has been created.

  • A UM mailbox policy has been created.


To use the Exchange Management Console to change the number of previous PINs to disallow

  1. In the console tree of the Exchange Management Console, expand the Organization Configuration node, and then click the Unified Messaging node.

  2. On the UM Mailbox Policies tab, select the UM mailbox policy that 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.

To use the Exchange Management Shell to change the number of previous PINs to disallow

  • Run the following command:

    Copy Code
    Set-UMMailboxPolicy -Identity MyUMMailboxPolicy -PINHistoryCount 10

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

For More Information

For more information about Unified Messaging PINs, see the following topics: