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Exchange Server 2010 : Upgrading from and Coexisting with Exchange Server 2007 (part 1)

12/29/2010 9:38:35 AM
The two example environments running Exchange Server 2007 are Fabrikam and Litware. Fabrikam is composed of 7,000 users and is currently running Exchange Server 2007 in a semi-distributed model; a logical view of their Exchange Server 2007 environment is illustrated in Figure 1.
Figure 1. Logical view of Fabrikam's Exchange Server 2007 environment


Litware, our second example Exchange Server 2007 environment, has 50,000 users in a regionally distributed environment; a logical view of their Exchange Server 2007 environment is shown in Figure 2.

Figure 2. Logical view of Litware's Exchange Server 2007 environment


1. Upgrading Exchange Server 2007 Computers to SP2

You need to apply Exchange Server 2007 SP2 to all Exchange Server 2007 CA and UM servers in your organization prior to installing the first server running Exchange Server 2010. Exchange Server 2007 SP2 is also required on all Exchange Server 2007 computers in any Active Directory site before introducing Exchange Server 2010 into that site.

2. Preparing Active Directory After Applying Exchange Server 2007 SP2

Although Exchange Server 2007 SP2 will apply the necessary Exchange Server 2010 schema changes to your Active Directory forest, you will still need to perform the setup /PrepareAD step in your environment prior to performing your first Exchange Server 2010 installation. Otherwise, /PrepareAD will be done automatically when the first server running Exchange Server 2010 is installed, assuming the account performing the installation has Enterprise Admins privileges and the computer is able to contact all domains in the forest on port 389. 

3. Deploying Exchange Server 2010 Computers

Deploying your Exchange Server 2010 computers for an upgrade from Exchange Server 2007 involves the same points to consider as discussed in this article.

4. Upgrading Client Access Services

The Client Access issues unique to upgrading from Exchange Server 2007 to Exchange Server 2010 are OWA and Exchange ActiveSync, which this section covers. Outlook Web App coexistence with Exchange Server 2007 OWA is similar to that discussed in the "OWA Coexistence" section under. OWA access is a redirect from the Exchange Server 2010 CA server to an Exchange Server 2007 CA server using the legacy host names configuration mentioned in the Section 3 section of this article if the Exchange Server 2007 mailbox is in an Internet-facing site. If the Exchange Server 2007 mailbox is in a non-Internet-facing site, the OWA session will be proxied from the Exchange Server 2010 CA server in the Internet-facing site to an Exchange Server 2007 Client Access server in the mailbox's site. Unlike Exchange Server 2003, however, Exchange Server 2007 is Active Directory site–aware, so you don't need to configure any OWA virtual directory properties for Exchange Server 2010 Client Access to locate the proper Exchange Server 2007 CA server. This OWA coexistence and proxy/redirect behavior for Litware is illustrated in Figure 3.

Although Exchange Server 2010 ActiveSync provides direct support for Exchange Server 2003 mailboxes, an Autodiscover and redirect to Exchange Server 2007 Client Access occurs for Exchange Server 2007 mailboxes with Windows Mobile 6.1 and higher. Windows Mobile 6.0 and lower, and all other ActiveSync clients, are proxied to Exchange Server 2007 CA servers.

Figure 3. Exchange Server 2010 and Exchange Server 2007 Client Access coexistence

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