The S*PAM _KiNgS site posted an article (also blogged by Donna and Bink), according to which Microsoft dropped the address abuse@microsoft.com. Messages to that address will generate the following auto-reply:
"Thank you for contacting Microsoft. Your e-mail will be handled by a Customer Service Representative within approximately 24 hours. Please note that the e-mail address you have contacted, "abuse@microsoft.com" will be retired on April 29, 2005. In the future, please visit http://www.microsoft.com/contactus to contact Microsoft."
The address abuse@domain is defined in RFC2142 and is intended for reporting inappropriate public behaviour (e.g., spam).
Just for curiosity, here's a short list of (almost) all the addresses that should exist on every mail system:
MAILBOX AREA USAGE
---------- ---------------- ---------------------------
ABUSE Customer Relations Inappropriate public behaviour
NOC Network Operations Network infrastructure
SECURITY Network Security Security bulletins or queries
MAILBOX SERVICE SPECIFICATIONS
---------- ---------------- ---------------------------
POSTMASTER SMTP [RFC821], [RFC822]
HOSTMASTER DNS [RFC1033-RFC1035]
USENET NNTP [RFC977]
NEWS NNTP Synonym for USENET
WEBMASTER HTTP [RFC 2068]
WWW HTTP Synonym for WEBMASTER
UUCP UUCP [RFC976]
FTP FTP [RFC959]