So ? What's the problem ?

Temporary change IP on Microsoft servers and wait for resolution from SpamCop.

Just for a record - 207.46.248.70/71 has no any reverse DNS records. Something that is a must for legitive servers.

Check this and find that there is even more funny results.
207.46.238.137 reversed to tide137.microsoft.com thich give only one incorrect IP 212.157.154.42 in return.
Or 207.46.238.143 -> tide143.microsoft.com -> No record.

This is plain wrong and a subject to fix.

I understand that there can some misterious reasons inside Microsoft to create following configuration - but they are unknown to me.
IT inside Microsoft are paid well to be able correct this in 1 hour ;o))