Messaging Hygiene at Microsoft v2.0
The collection of documents "Messaging Hygiene at Microsoft" have been updated to version 2.0. These documents provide us a detailed description on how Microsoft IT manages the large quantities of spam and malware-infected messages in its inbound Internet e-mail traffic.
I haven't had the time to read them yet, but a quick look unveiled that Sender ID is now mentioned.
The documents are available here.