[haydn3]

Isn't connecting to Microsoft being online? Unless you're running exchange on an OFFLINE, LOCAL NETWORK your outgoing traffic to Google will contain metadata and you're not stopping anything by removing the SIM card other than inconveniencing yourself.

It still calls home, it's still online. Lock down Microsoft and Google's IPs permanently, outbound, on all networks you use or this won't work.

[raintrees]

I run my own servers, so no, no connection to Microsoft except for updates.

Google is not involved, my DNS is my own server with the base servers as their lookups, not Google DNS. My PDA only connects over WiFi, since there is no SIM.

So unless Google is purposely getting involved with a WiFi connection to a local, private server, they are not involved, either.

I stripped off all of the other apps as well.

[raintrees]

To further clarify, I have been a dev for 30 years, mostly the Microsoft arena, and more recently, Linux. I also run a service business for small business clients, and eat my own dog food. In so doing, I have off and on again been an MSDN member, which included licenses (for development) of the Microsoft technology stack, which until recently included their Small Business Server product. That is how I got my start.

I have run my own Exchange Server(s) since 1995. And DNS, DHCP, etc.