Microsoft using Spamhaus Lists

An on the ball reader sent me a note today showing a bounce message indicating microsoft was rejecting mail due to a Spamhaus Blocklist Listing.
5.7.1 Client host [10.10.10.10] blocked using Spamhaus. To request removal from this list see http://www.spamhaus.org/lookup.lasso (S3130). [VE1EUR03FT043.eop-EUR03.prod.protection.outlook.com]
The IP in question is listed on the CSS, which means at a minimum Microsoft is using the SBL. I expect they’re actually using the ZEN list. ZEN provides a single lookup for 3 different lists: the SBL, XBL and PBL. The XBL is a list of virus infected machines and the PBL is a list of IPs that the IP owners state shouldn’t be sending email. Both of these lists are generally safe to use. If MS is using the SBL, it’s very likely they’re using the other two as well.
 

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We’re listed on Spamhaus’ list, any advice on how to get off? Our email provider has a plan, just looking for more input. 
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The fastest way off it to cut WAY back on who you are mailing to. Mail only to addresses you know, for sure, based on activity in the email, want your mail. Then you can start to go through the other addresses and make decisions about how to verify that those addresses belong to the people you think they do.
If you’re at an ESP, do what they tell you to do. Most ESPs have dealt with this before.
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