Microsoft's internal antivirus software

There are many antivirus options available in the Exchange environment. Since Microsoft doesn't market an option, what antivirus solutions do they use internally?

There are many options for antivirus in the Exchange environment. However, do you know what antivirus software Microsoft uses internally, since they don't market an option?
I think it is safe to say that Sybari Antigen for Exchange is being used internally. And to some degree all antivirus vendors that are listed as Microsoft partners are being used internally.

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