Microsoft - you don't correctly run MTA's either.

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If one IP is suspect, well, then they must all be.
A message you sent could not be delivered to some or all of its recipients.
The following addresses were undeliverable: 5.7.1 Unfortunately, messages from [i.p.add.ress] weren't sent.
Please contact your Internet service provider since part of their network is on our
block list (AS3140). You can also refer your provider to

Lets all try to get along, shall we?
Mail server running from that IP for, dunno, about 8 years without issue.
Why can't you keep track of IPv4 space for your smtp blacklist needs?
Makes me suspect your ability to run bing - a web cataloging / search service :-)