Would it shock your conscience to learn that Microsoft security operations probably have contacts with the Redmond PD and that they occasionally discuss concerns?

The existence of a mailing list or something of that sort isn't particularly worrying. I don't think it's reasonable to expect a firewall between police departments and local businesses any more that it would be reasonable to expect one between PDs and local residents.

I would be alarmed if it turned out that Amazon was giving the Seattle PD direct, warrantless access to data about their consumers, or something like that. But there's no evidence presented here of anything particularly sketchy going on.