ISA Server 2006 and Exchange 2007 were developed to coexist and provide an increased level of security for your messaging environment. When you use the New Exchange Publishing Rule Wizard to configure your ISA Server computer to allow client access, you automatically configure ISA Server settings that are required for the new features in both Exchange 2007 and ISA Server 2006 to work correctly.

For more information about how to configure ISA Server 2006 for Exchange 2007, see Configuring ISA Server 2006 for Exchange Client Access.

When you deploy Exchange 2007, we recommend that you upgrade any earlier versions of ISA Server that you are using. Deploying Exchange 2007 in an environment that has been configured to use an earlier version of ISA Server, such as ISA Server 2004, will require changes to your ISA Server rules that you might have configured for client access.

When you configure ISA Server 2004 or ISA Server 2000, you will have to create new server or Web publishing rules for the new Client Access servers that you want your users to access. Table 1 describes the virtual directories to use as paths for the Web and server publishing rules that you must create for client access to Exchange when you use an earlier version of ISA Server than ISA Server 2006. Make sure that you use only the paths for the client applications that you plan to use. For example, if you do not plan to use Microsoft Exchange ActiveSync, you do not have to publish the Microsoft-Server-ActiveSync virtual directory.

Table 1   Exchange 2007 virtual directories that are used as paths in ISA Server publishing rules

For more information about how to configure client access to Exchange, see the following topics:

• Using ISA Server 2006 with Outlook Web Access
  
• Configuring ISA Server 2006 for Exchange Client Access