Make sure outlook is the only approved mail client
Even though we have conditional access and MAM on all users, everyone can download Edison mail client and access their mail without enrollment.
If we wish to restrict users from using Edison mail client, we have to disable EWS but then we lose access to other exchange online features, so we can´t do that.
Microsoft says in their product commercials that you can restrict all other mail clients other that outlook, but I don´t see that is true since Edison mail client is able to connect. Try it yourself.
We too have this issue, I don't understand how Edison email app is doing this. In the logs it is picking up the right conditional access policy which is a block but it says not applied... What the actual...