Microsoft IP's are hammering website

Question

Thousands of IP addresses, all belonging to Microsoft are hammering my website constantly for two days, how could this be prevented? Here are some examples from Awstats:

13.67.151.44

13.67.151.47

13.67.151.204

13.67.168.110

13.67.168.114

40.69.161.129

40.69.161.231

40.69.164.112

40.69.167.139

52.173.151.171

52.176.40.86

Answer 1

You can report abuse coming from Microsoft owned IP addresses here

Answer 2

Thanks, I've reported the abuse and hope to have Microsoft take any action regarding this.