Upgrade from Exchange 2007 Unified Messaging

Applies to: Exchange Server 2010

Unified Messaging (UM) was introduced in Microsoft Exchange Server 2007. In organizations that deployed Exchange 2007 Unified Messaging and now want to upgrade to Microsoft Exchange Server 2010 Unified Messaging with all its new features, there are tasks the Exchange administrator must perform to successfully upgrade their UM environment.

Contents

Overview of Upgrading to Exchange 2010 Unified Messaging

Upgrade Scenarios

Upgrading Custom Prompts from Exchange 2007 Unified Messaging

Autodiscover and Exchange Web Services in Unified Messaging

Overview of Upgrading to Exchange 2010 Unified Messaging

Upgrading is the process of taking an existing Exchange 2007 Unified Messaging environment, installing Exchange 2010 UM servers, and then removing and uninstalling the Exchange 2007 UM servers. However, during this process, there's the possibility at any time that an upgraded Exchange 2010 organization would contain both Exchange 2010 and Exchange 2007 UM servers. Such an organization would also contain both Exchange 2007 and Exchange 2010 Mailbox, Client Access, and Hub Transport servers. All the Exchange 2007 servers, including the UM server, must have Exchange Server 2007 Service Pack 2 (SP2) installed. For more information, see Download Exchange Server 2007 Service Pack 2 (SP2).

UM-enabled users who have Exchange 2007 mailboxes will get the features with Exchange 2007 Unified Messaging, and UM-enabled users who have Exchange 2010 mailboxes will get all the features included with Exchange 2010 Unified Messaging. The following table summarizes upgrade scenarios and the UM features that are available when Exchange 2007 and Exchange 2010 Unified Messaging coexist in the same Exchange organization.

Unified Messaging with Exchange 2007 and Exchange 2010 mailboxes

When you install the first Exchange 2010 UM server and add it to an existing Exchange 2007 organization, you must add the Exchange 2010 UM server to an existing UM dial plan that contains Exchange 2007 UM servers. Then you must configure each IP gateway or IP PBX to send all incoming calls to the Exchange 2010 UM servers within the same UM dial plan.

When an incoming call is received by an Exchange 2010 UM server, and the UM-enabled user's mailbox is located on an Exchange 2010 Mailbox server, the Exchange 2010 UM server will process the incoming call. If the user's mailbox is located on an Exchange 2007 Mailbox server, the incoming call will be routed to an Exchange 2007 UM server within the same UM dial plan, and the incoming call will be processed. If there are multiple Exchange 2007 UM servers in the same dial plan, the Exchange 2010 UM server will send the incoming call to the Exchange 2007 UM servers using a round robin mechanism.

After all UM-enabled users' mailboxes are migrated to an Exchange 2010 Mailbox server, the Exchange 2007 UM servers can be removed from the UM dial plan.

Upgrade Scenarios

When you're upgrading from Exchange 2007 Unified Messaging to Exchange 2010 Unified Messaging, there are two basic scenarios:

• Full Upgrade   In a full upgrade, you replace all the Exchange 2007 UM servers with Exchange 2010 UM servers, and all existing Exchange 2007 UM-enabled mailboxes are moved to Exchange 2010 Unified Messaging. During this process, you'll most likely have both Exchange 2007 and Exchange 2010 UM servers coexisting in the same Exchange organization. At the end of the process, the Exchange 2010 UM server will answer all incoming calls and allow UM-enabled users to access their mailbox when they call in to an Outlook Voice Access number that's configured on a Exchange 2010 UM dial plan.

  Important

  If you're uninstalling the last Exchange 2007 UM server in the Exchange 2010 organization, run the following command on an Exchange 2010 UM server within the same organization as the Exchange 2007 UM server: Set-UMDialPlan -identity MyUMDialPlan -LegacyPromptPublishingPoint $null. Running this command will force the Exchange 2007 UM server to unbind from the dial plan. You must run this command before you remove the last Exchange 2007 server from the Exchange 2010 organization.

• **Partial Upgrade   **In a partial upgrade, a portion of the existing Exchange 2007 UM-enabled mailboxes are moved to Exchange 2010 Unified Messaging. A partial upgrade is a term used to describe upgrading from an Exchange 2007 organization to an Exchange 2010 organization. In partial upgrades, Exchange 2010 UM servers will only process calls for UM-enabled mailboxes that are on Exchange 2010 Mailbox servers. If you're deploying Exchange 2010 Unified Messaging, and it will coexist with Exchange 2007 UM, you must keep at least one Exchange 2007 UM server deployed in your organization and it must be added to the same dial plan as the Exchange 2010 UM server or servers.
  When you perform a partial upgrade from Exchange 2007 Unified Messaging to Exchange 2010 Unified Messaging, incoming calls will be handled differently from the way they're handled after a full upgrade, depending on the type of incoming call and whether UM is integrated with Microsoft Office Communications Server 2007. The following are some ways they're handled differently:

  • Call Answering   In call answering calls, the extension number of the destination mailbox is provided in the SIP INVITE header when the UM server answers the incoming call. Based on the information provided, it verifies the mailbox version, and the Exchange 2010 UM server immediately identifies the location of the destination UM-enabled mailbox. If the recipient mailbox is being hosted on an Exchange 2007 Mailbox server, the Exchange 2010 UM server will redirect the incoming call to an Exchange 2007 UM server in the same dial plan.
    
  • Subscriber Access   There are two subscriber access scenarios:
    Scenario 1: When a caller dials in to a subscriber access number configured on a dial plan from a phone number that isn't recognized by a UM server, and the incoming call contains no information about the destination user's mailbox in the SIP INVITE header, the Exchange 2010 UM server will take the call and then prompt the caller to provide the extension number by pressing the corresponding keys on the phone keypad. After the caller has provided the extension number, the Exchange 2010 UM server will identify the user, locate the UM-enabled mailbox, and check the version of the mailbox. If the mailbox is located on an Exchange 2007 Mailbox server, the Exchange 2010 UM server will do a SIP REFER request and send the call to an Exchange 2007 UM server.
    Scenario 2: When a caller dials in to a subscriber access number configured on a dial plan, and the Exchange 2010 UM server identifies the calling number as an extension for a UM-enabled user with an Exchange 2007 mailbox, the call will be redirected to an Exchange 2007 UM server. The Exchange 2010 UM server will make a redirect request and send the call to an Exchange 2007 UM server.
    
  • Office Communications Server   Communications Server 2007 can't determine the version of the mailbox for a UM-enabled user. So when a call is received by Communications Server 2007, and it redirects the call to another UM server in the same dial plan, either an Exchange 2007 UM server or an Exchange 2010 UM server might take the call. This causes a problem when you perform a partial upgrade, because the incoming call will fail if it's received by an Exchange 2007 UM server and the UM-enabled user's mailbox is on an Exchange 2010 Mailbox server. The call will fail because Exchange 2007 UM servers can't process calls for UM-enabled users who have Exchange 2010 mailboxes.
    The reason the incoming call will fail is that Communications Server 2007 can't tell whether the UM server that it redirected the call to is an Exchange 2007 UM server or an Exchange 2010 UM server.
    If Communications Server 2007 is used as an IP gateway, and there are Exchange 2007 mailboxes that are enabled for UM, a new SIP URI dial plan will be required. The new SIP URI dial plan must contain only Exchange 2010 UM servers. The new dial plan is required to ensure that incoming calls are redirected only to Exchange 2010 UM servers.

The following table contains information about the tasks that are required to perform a partial or full upgrade from earlier versions of Microsoft Exchange to Exchange 2010 Unified Messaging.

Upgrading to Exchange 2010 Unified Messaging

Upgrading Custom Prompts from Exchange 2007 Unified Messaging

There are many custom greetings used by UM dial plans and auto attendants, including welcome greetings for dial plans and after hours welcome greetings and menus, business hours and non-business hours welcome greetings and menus, and key mappings for UM auto attendants. All these audio files that are used by Unified Messaging are known as custom prompts.

Exchange 2007 Custom Prompts Overview

In Exchange 2007, the Copy-UMCustomPrompt cmdlet queries the appropriate dial plan object in Active Directory to determine the location of the prompt publishing point. There is only one prompt publishing point for each dial plan, and it's stored as a Windows file share (also known as UNC) path that identifies a file share available for dial plan and auto attendant custom prompts. After the location of the prompt publishing point is determined, the cmdlet validates the content in the custom prompt, and verifies that it's in the correct format and uses a supported audio codec. If the custom prompt passes the validation tests, the cmdlet copies the prompt content to the prompt publishing point.

After the custom prompt is copied to the prompt publishing point, any necessary directory updates are made and the prompt is copied to each UM server in the dial plan. After the custom prompt is added to the appropriate folder on the UM server that's configured as the prompt publishing point, the Microsoft Exchange File Distribution service that runs on each UM server refers to the prompt publishing point and determines whether the files in the prompt publishing point have changed or additional files have been added. If files have been changed or additional files exist, the other UM servers pull the custom prompts from the prompt publishing point and copy them to the correct location in the \\<Server name>\ExchangeUM folder that exists on a local drive. After the custom prompt is copied to the prompt publishing point using the Copy-UMCustomPrompt cmdlet, use the Set-UMDialPlan or Set-UMAutoAttendant cmdlets to configure the dial plan or auto attendant to use the custom greeting file or prompts.

Exchange 2010 Custom Prompts

Custom prompts are also available in Exchange 2010 Unified Messaging for dial plans and auto attendants. The prompt publishing point that was available in Exchange 2007 Unified Messaging doesn't exist in Exchange 2010. The system mailboxes that are created when you install Exchange 2010 to support features such as Message Approval and Multi-Mailbox Search are also used in Exchange 2010 Unified Messaging to store dial plan and auto attendant custom prompts.

By using an Exchange 2010 system mailbox, custom prompts can be backed up and restored along with other mailboxes in a database. This reduces the amount of resources that are needed. Storing custom prompts in a system mailbox removes any possible inconsistencies that may have occurred between Active Directory and the Microsoft Exchange File Distribution service in Exchange 2007 Unified Messaging. For details about the system mailbox, see Overview of the Mailbox Server Role.

Before you upgrade from Exchange 2007 Unified Messaging to Exchange 2010 Unified Messaging, you must copy the custom prompts that existed for Exchange 2007 UM dial plans and auto attendants to a folder on an Exchange 2010 UM server using the Copy-UMCustomPrompt cmdlet and then import those custom prompt files to an Exchange 2010 UM server. Custom prompts can be imported to Exchange 2010 UM by using the Import-UMPrompt cmdlet. The Exchange 2007 Unified Messaging cmdlet Copy-UMCustomPrompt isn't supported in Exchange 2010 UM for copying custom prompts. For details, see Import and Export Custom Prompts for Unified Messaging.

Use the following syntax to import custom prompts for Exchange 2010 UM dial plans:

Import-UMPrompt -PromptFileData <Byte[]> -PromptFileName <String> -UMDialPlan <UMDialPlanIdParameter> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-WhatIf [<SwitchParameter>]]

Use the following syntax to import custom prompts for Exchange 2010 UM auto attendants:

Import-UMPrompt -PromptFileData <Byte[]> -PromptFileName <String> -UMAutoAttendant <UMAutoAttendantIdParameter> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-WhatIf [<SwitchParameter>]]

The following table contains the steps that are required to ensure that custom prompts are available on the Exchange 2010 and Exchange 2007 UM servers.

Steps for Custom Prompts

Autodiscover and Exchange Web Services in Unified Messaging

The Autodiscover service configures client computers running Microsoft Office Outlook 2007 or Outlook 2010 in addition to supported mobile phones. The Autodiscover service provides access to Exchange features for Outlook 2007 or Outlook 2010 clients connected to your Exchange messaging environment. The Autodiscover service must be deployed and configured correctly for these Outlook clients to automatically connect to Exchange features, for example, the offline address book, the Availability service, and Unified Messaging. For details, see Understanding the Autodiscover Service.

In an environment that contains both Exchange 2007 and Exchange 2010 servers, if the recipient has a mailbox that's hosted on an Exchange 2010 Mailbox server, the Autodiscover request must be directed to an Exchange 2010 Client Access server and not to an Exchange 2007 Client Access server. If Exchange 2007 SP2 isn't installed on the Exchange 2007 Client Access server, the Exchange 2007 Client Access server won't redirect correctly. When the Exchange 2007 Client Access server tries to generate an Autodiscover response, it isn't aware that there's an Exchange 2010 UM virtual directory and will create an incorrect value for the Unified Messaging URL that's used. You must install Exchange 2007 SP2 to ensure that the Exchange 2007 Client Access server redirects requests for Exchange 2010 UM-enabled users to the correct UM URL.

Outlook and Microsoft Office Outlook Web App use several URL properties, shown through Autodiscover, to enable UM features such as Play on Phone. When these URL properties are used, the values for the URL are returned but depend on both the version of Outlook and the Mailbox version for the user. The following table shows the versions of Outlook, the version of the user's Exchange mailbox, and which URL will be used.

Versions of Outlook and Exchange mailboxes