Exchange 2007 Deemphasized Functionality

Many features found in earlier versions of Microsoft Exchange Server have been deemphasized in Exchange 2007. “Deemphasizing” means that these features are still supported by Microsoft, but future development is not planned since they are considered to be legacy features, and future versions of Exchange (now code named “Exchange 14”) will no longer support them.
Some of these features have replaced by other Microsoft products, other simply do not exist, and require you to keep an older version of Exchange 2000/2003 if you wish to continue using them.

• Public folders – Free/busy calendaring functionality is provided by the Availability service. If you need additional functionality, migrate to SharePoint Portal Server or a similar product. Future versions of Exchange will no longer support Public Folders, and since Exchange 2007 can now be installed without even creating the default Public Folder tree, you should plan to migrate existing PF infrastructure and applications to other products.
• Proxy address generators – Use the Exchange Management Shell.
• CDO 1.2.1 – This functionality is provided by the Exchange Web Services.
• MAPI32 – This functionality is provided by the Exchange Web Services.
• CDOEX (CDO 3.0) – This functionality is provided by the Exchange Web Services.
• Exchange WebDAV extensions – This functionality is provided by the Exchange Web Services.
• ExOLEDB – This functionality is provided by the Exchange Web Services.
• Store events – This functionality is provided by the Notification Web service.
• Streaming backup APIs.
• Exchange 2003 Virus Scanning Application Programming Interface (VSAPI).

Other features are no longer supported. Read Exchange 2007 Discontinued Features for more info.

Links

Deploying a Simple Exchange Server 2007 Organization