To disable Exchange ActiveSync and email connectivity, you need to disable the following Exchange Features: Exchange ActiveSync and Outlook Web App.
As for OWA for Devices, currently the feature is not supported by Adaxes natively. By the time when we were developing our Exchange ADSI API that is used by Adaxes to interact with Exchange, the feature was still in development by Microsoft. Depending on various preview builds of Exchange 2013, it appeared, and then disappeared, and then appeared again, so we decided not to implement it until a final decision is made by Microsoft. Now, that things seem to have settled down, we'll add the support for it in one of the future releases.
For now, you can disable the feature with the help of a PowerShell script. You can create a Custom Command that will disable the feature by running a script or add a script to an existing Custom Command, Scheduled Task or Business Rule. To add such a script:
Add the Run a program or PowerShell script action to your Business Rule, Custom Command or Scheduled Task.
In the Script field, paste the following script:
$objectId = [Guid]$Context.TargetObject.Get("adm-O365ObjectId")
return # No office 365 account
$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell/" `
-Credential $Context.GetOffice365Credential() -Authentication Basic -AllowRedirection
Import-PSSession $Session -AllowClobber -DisableNameChecking
Set-CASMailbox $objectId.ToString() -OWAforDevicesEnabled $false
Add a short description for the script and click OK.