Exchange 2007 - Planning Roadmap for Upgrade and Coexistence

Articolo
05/20/2011

[Questo argomento è in fase di definizione.]

Si applica a: Exchange Server 2010

Ultima modifica dell'argomento: 2009-12-04

You can deploy Exchange 2010 in an existing Exchange 2007 organization. This topic provides an overview of the planning considerations and configuration steps that you must take when you want Exchange 2010 to coexist with Exchange 2007.

Existing Exchange Organization Planning

Before you go too far in your planning for Exchange 2010, make sure your current Exchange 2007 organization meets the following requirements. For more information, see the following topics:

Understanding Coexistence

Any organization that upgrades from Exchange 2007 to Exchange 2010 will experience a period of coexistence when parts of the organization still use Exchange 2007 functionality and other parts have completed the upgrade to Exchange 2010.

Importante

You can only install more Exchange 2007 servers in your organization if you had an Exchange 2007 server there when the first Exchange 2010 server was installed.

Here are a few things about coexistence that you should be aware of:

Management interfaces In Exchange 2010, you can manage Exchange 2010 servers and mailboxes by using either the Exchange Management Console (EMC) or the Exchange Management Shell. You can also use the EMC to view some attributes on Exchange 2007 servers. For more information, see Interoperabilità di Exchange Management Console.
Server role features The Exchange 2010 server role features that are available to clients in the Exchange organization during the coexistence period depend on the version of the Exchange server where the user's mailbox is stored and the version of the e-mail client application that is used to access Exchange.
For more information about how server-to-server communication occurs in Exchange 2007, see Informazioni sulla pipeline di trasporto.
Routing groups A large organization that has many routing groups must plan their routing topology to maintain mail flow during the coexistence period. When you plan for a period of coexistence between Exchange 2010 and Exchange 2007, you need to understand the differences in how each version determines its routing topology. For more information about routing and coexistence, see Aggiornamento da Exchange 2007 Transport.

Choosing the order of Active Directory sites for upgrade

When you are ready to begin upgrading your organization to Exchange 2010, you must begin with your servers in the internet accessible Active Directory sites first, and then upgrade your internal Active Directory sites. It is not supported to upgrade an internal Active Directory site before all your Internet-accessible sites have been upgraded. This is because Client Access server to Client Access server proxying is only supported from the newer CAS versions (Exchange 2010) to older CAS versions (Exchange 2007) and not the other way around.

Overview of upgrade steps from Exchange 2007 to Exchange 2010
Processo di aggiornamento di Exchange 2007 a Exchange 2010

Choosing the order of server roles for upgrade

Within the first Active Directory site or sites you are upgrading, the first Exchange 2010 server role you should install is the Client Access server role. When you are ready to begin your deployment, it is recommended to upgrade a single Active Directory site at a time to Exchange 2010. Depending on the size of your Active Directory site, this might be a single Client Access server computer or a load balanced array of Exchange 2010 Client Access servers. The recommended order to install the Exchange 2010 server roles is the following:

Client Access Server role
Hub Transport Server role
Mailbox Server role
Unified Messaging (UM) Server role
Edge Transport Server role

Nota

When upgrading to Exchange 2010, you can't perform an in-place server upgrade on an existing Exchange server

For detailed information about upgrading the above server roles, see the following topics:

Understanding Exchange 2007 and Exchange 2003 Mixed Mode Coexistence

Quando si è pronti a eseguire l'aggiornamento di un ambiente in modalità mista, aggiornare ogni sito di Active Directory individualmente. Se sono presenti siti di Active Directory in cui è presente solo Exchange 2007 o Exchange 2003, attenersi alle istruzioni per l'aggiornamento da tale versione per il rispettivo sito di Active Directory. Ad esempio, se è presente Exchange 2007 nel sito Active Directory A, attenersi alle istruzioni di aggiornamento per Exchange 2007. Se è installato Exchange 2003 nel sito Active Directory B, attenersi alle istruzioni di aggiornamento per Exchange 2003. Per ulteriori informazioni sull'aggiornamento delle versioni di Exchange 2003 e Exchange 2007, vedere Upgrade to Exchange 2010.

Se sono presenti siti di Active Directory con entrambi Exchange 2003 e Exchange 2007 installati, attenersi alle istruzioni di aggiornamento per entrambi Exchange 2003 e Exchange 2007 ed eseguire i passaggi di aggiornamento richiesti per entrambi. Per ulteriori informazioni sull'aggiornamento a Exchange 2010 in questo scenario, vedere gli argomenti seguenti:

Administration Differences

Management Console (EMC) di Exchange è disponibile sia in Exchange Server 2010 che Exchange Server 2007. Segue un elenco delle attività e azioni che è possibile eseguire utilizzando EMC in Exchange 2010 o Exchange 2007:

Azioni che creano oggetti, come le nuove cassette postali o una nuova rubrica offline (OAB) possono essere eseguite solo sulla stessa versione di EMC dell'oggetto di destinazione. Ad esempio, la creazione di una cassetta postale su un server Cassetta postale di Exchange 2007 deve essere eseguita con EMC in Exchange 2007. Quanto segue vale per:
- I database Cassette postali di Exchange 2007 non possono essere gestiti da EMC in Exchange 2010, anche se possono essere visualizzati.
- EMC in Exchange 2010 non può abilitare o disabilitare le cassette postali di messaggistica unificata di Exchange 2007.
- EMC in Exchange 2010 non può gestire i dispositivi portatili di Exchange 2007.
Le azioni che richiedono la visualizzazione degli oggetti possono essere eseguite da qualsiasi versione di EMC su qualsiasi versione di oggetti di Exchange, con alcune eccezioni:
- È possibile visualizzare gli oggetti delle regole di trasporto di Exchange 2010 e Exchange 2007 solo dalla versione corrispondente di EMC.
- È possibile visualizzare i server di Exchange 2010 e Exchange 2007 solo dalla versione corrispondente di EMC.
- Lo strumento Visualizzatore code in EMC in Exchange 2010 non può collegarsi ad un server Exchange 2007 per visualizzare le code o i messaggi.
  
  Nota
  
  Se un oggetto di Exchange 2007 (come un gruppo di archiviazione) non è più presente in Exchange 2010, non è prevista, né fornita alcuna interoperabilità.
Non è possibile scambiare le attività di configurazione della verifica messaggi tra Exchange 2010 e Exchange 2007. È necessario utilizzare gli strumenti di verifica messaggi di Exchange 2007 all'interno dei server Exchange 2007 e gli strumenti di verifica messaggi di Exchange 2010 all'interno dei server Exchange 2010.

Coexistence with the Client Access Server Role

The Client Access server role can coexist with Exchange 2007 Client Access servers. Before you start upgrading your first Active Directory site, you must install Exchange 2007 Service Pack 2 on all Exchange 2007 Client Access servers within your organization.

Once the first Exchange 2010 Client Access server or Client Access server array has been installed in your organization, the Autodiscover Service on the Exchange 2007 Client Access servers will redirect users with mailboxes on an Exchange 2010 Mailbox server to the appropriate Exchange 2010 Client Access end point.

Installation of Exchange 2010 within your organization requires the creation of a second DNS hostname. When you install your first Exchange 2010 Client Access server in your organization, you will also need to create a new hostname. If your current hostname is https://contoso.com, we recommend creating http://legacy.contoso.com. You will need to install your first Exchange 2010 Client Access server or Client Access server array, copy the appropriate Outlook Web Access, Exchange ActiveSync, POP3, IMAP4, Exchange Web Services, and Autodiscover service settings, and then configure http://legacy.contoso.com to point to your Exchange 2007 Client Access servers and https://contoso.com to point to your Exchange 2010 Client Access server or Client Access server array. You will need the appropriate SSL certificate for both hostnames. We recommend a Subject Alternative Name (SAN) which can support multiple hostnames. For more information, see Aggiornamento da Exchange 2007 Client Access.

Coexistence with Exchange ActiveSync

For coexistence with Exchange ActiveSync, you will need to configure a legacy DNS hostname. Users with mailboxes on Exchange 2007 Mailbox servers will be proxied from Exchange 2010 to Exchange 2007.

Nota

When moving a user's mailbox from Exchange 2007 to Exchange 2010, some users will be prompted to perform a full synchronization of their mailbox. This is a requirement for many mobile phones and will only occur during the first synchronization of the user's phone after their mailbox is moved.

When a user’s mailbox is on Exchange 2007, they will experience the Exchange 2007 version of EAS during co-existence. That user will get the Exchange 2010 functionality of EAS when their mailbox is moved to Exchange 2010. For more information about coexisting with Exchange ActiveSync, see Aggiornamento da Exchange 2007 Client Access.

Coexistence with Outlook Web App

If a user with a mailbox on an Exchange 2007 Mailbox server connects to an Exchange 2010 Client Access server in the same Active Directory site, they will be redirected to an Exchange 2007 Client Access server within that site. If a user with a mailbox on an Exchange 2007 Mailbox server connects to an Exchange 2010 Client Access server in a different Active Directory site and there is no Internet-accessible Client Access server in the destination Active Directory site, they will be proxied to an Exchange 2007 Client Access server within the destination Active Directory site. As with Exchange 2007, if a user accesses an Exchange 2010 Client Access server in an Active Directory site that is different from the one where their mailbox resides and there is an Internet-accessible Client Access server in the Active Directory site that contains the user's mailbox, then the user will be redirected to the Client Access server in the destination Active Directory site. When a user’s mailbox is on Exchange 2007, they will experience the Exchange 2007 versions of OWA during co-existence. That user will get the Exchange 2010 functionality of OWA when their mailbox is moved to Exchange 2010.

When upgrading Outlook Web Access, there are three different authentication scenarios that need to be examined.

Forms based authentication terminating at an Exchange 2007 Client Access server. In this scenario, the Exchange 2010 Client Access server will redirect the user to the legacy Client Access server and a second sign on won't be required.
Third party authentication solution in front of the Exchange 2007 Client Access server. This scenario requires an ISA Server or other authentication solution in front of the Exchange servers. In this situation, users will only be required to authenticate at the authentication solution, which will pass the credentials to any required Exchange 2010 or Exchange 2007 servers.
Non-forms based authentication terminating at an Exchange 2007 Client Access server. Outlook Web Access 2010 will redirect the user to a legacy Exchange 2007 Client Access server. Whether the user needs to re-authenticate or not depends on the authentication mechanism used. For example, if Windows Integrated authentication is used, the user will experience a single sign-on with Windows authentication. If HTTP Basic authentication is used, the user will need to authenticate twice.

The upgrade and coexistence steps you must take for Outlook Web Access depend on which authentication scenario you have chosen. For more information about coexisting with Outlook Web Access, see Aggiornamento da Exchange 2007 Client Access.

Coexistence with the Hub Transport Server Role

The Hub Transport server role is designed to handle all mail flow for the Exchange organization. It is also responsible for handling Transport Rules, Journaling policies and message delivery. This server is deployed in the Active Directory forest and is required for Exchange 2010 mailboxes to send and receive messages. Messages that are sent to the Internet are relayed by the Hub Transport server to the Edge Transport server or a third-party smart host.

You can add an Exchange 2010 Hub Transport server to an existing Exchange organization after you successfully deploy Exchange 2010 CAS servers. After you introduce Exchange 2010 Hub servers to your Exchange 2007 environment, you still need to maintain your Exchange 2007 Hub servers. Exchange 2010 Mailbox servers can only communicate with Exchange 2010 Hub servers, and Exchange 2007 Mailbox servers can only communicate with Exchange 2007 Hub servers. When a message is sent from a mailbox on an Exchange 2010 Mailbox server to a mailbox that is on an Exchange 2007 Mailbox server, the message is first submitted to the closest Exchange 2010 Hub server in the site. This server then relays the message to an Exchange 2007 Hub server in the same site which finally delivers the message to the Exchange 2007 Mailbox server.

To learn more about introducing Exchange 2010 Hub Transport servers to your Exchange 2007 organization, see Aggiornamento da Exchange 2007 Transport.

Coexistence with the Mailbox Server Role

The Mailbox server role can coexist with Exchange 2007 mailbox servers. If you move a mailbox from Exchange 2007 to Exchange 2010, and the mailbox is part of an e-mail address policy, the e-mail addresses for that mailbox is automatically updated based on the configuration of the e-mail address policy. If the mailbox had a primary SMTP address that differs from the e-mail address that is enforced by the e-mail address policy, that SMTP address becomes a secondary SMTP address and the e-mail address generated by the e-mail address policy becomes the primary SMTP address. For information about how to move mailboxes, see Gestione richieste di spostamento.

You can replicate public folder data between Exchange 2010 and Exchange 2007 public folder databases. For more information on Exchange 2010 and Exchange 2007 public folder coexistence, see Informazioni sulle cartelle pubbliche.

Coexistence with the Edge Transport Server Role

The Edge Transport server role is designed to provide improved antivirus and anti-spam protection for the Exchange organization. The Edge Transport server also applies policies to messages in transport between organizations. This server role is deployed in the perimeter network and outside the Active Directory forest. The Edge Transport server can be deployed as a smart host and SMTP-relay server for an existing Exchange 2007 organization.

You can add an Edge Transport server to an existing Exchange organization without upgrading the internal Exchange servers or making any organizational changes. You do not have to perform any Active Directory preparation steps when you install the Edge Transport server. The Edge Transport server provides antivirus and anti-spam protection as messages enter the network.

When an Edge Transport server is deployed to support an Exchange organization that has not yet deployed Exchange 2010, a limited set of features are available. You can't create an Edge Subscription in this scenario. Therefore, you can't use the Recipient Lookup or safelist aggregation features. For more information on Edge Transport servers and coexistence, Aggiornamento da Exchange 2007 Transport.

Coexistence with Unified Messaging

When you install the first Exchange 2010 Unified Messaging Server and add it to an existing Exchange 2007 organization, you must first add the Exchange 2010 Unified Messaging server to an existing Unified Messaging dial plan that contains Exchange 2007 Unified Messaging servers. Then you'll need to configure each IP gateway or IP PBX to send all incoming calls to the Exchange 2010 Unified Messaging servers within the Unified Messaging dial plan and not the Exchange 2007 UM servers.

When an incoming call is received by an Exchange 2010 Unified Messaging server and the Unified Messaging-enabled user's mailbox is located on an Exchange 2010 Mailbox server, the Exchange 2010 Unified Messaging server will process the incoming call. If the user's mailbox is located on an Exchange 2007 Mailbox server, the incoming call will be redirected to an Exchange 2007 Unified Messaging server within the same Unified Messaging dial plan and the incoming call will be processed.

Once all Unified Messaging enabled users mailboxes have been migrated to an Exchange 2010 Mailbox server, the Exchange 2007 Unified Messaging servers can be removed from the Unified Messaging dial plan. For more information, see Aggiornamento da Messaggistica unificata di Exchange 2007.

Supported Topologies

Exchange 2010 supports the following topologies:

Single forest, multiple Active Directory sites.
Multiple forests (resource forest model), multiple Active Directory sites.
Single Active Directory site.

Exchange 2010 doesn't support the following topologies:

Coexistence with Exchange 2000 server or earlier.
Coexistence with Exchange 2003 versions prior to Service Pack 2 (SP2).
Installing an older version of Exchange into a newly created Exchange 2010 organization.

For more information on deploying in these topologies, see Deploy Multiple Forest Topologies.

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