Edit 4/20/2010: Replaced the post body with the link explaining how to get most current information on the subject:
Learn about Exchange 2010 Virus Scanning (VS) API 2.6.1 and VSAPI TAP
The VSAPI 2.6.1 provides programmatic interfaces for a Virus Scanning application to access items and attachments stored in Exchange. The VSAPI 2.6.1 is only provided to organizations enrolled in the VSAPI TAP program.
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