Sophos exclusions for Microsoft Endpoint Configuration Manager?

Are there logs to see what was block, what was scanned and what Sophos 'touched'?

Are there logs to see what was block, what was scanned and what Sophos 'touched'?

By making the following change in the registry you can enable verbose logging. Another option for seeing what is being scanned in real-time is to use ProcessMonitor, then to isolate Sophos File Scanner as the main process you wish to monitor. 

• Access the following registry key:
  
  HKLM\SOFTWARE\Sophos\Sophos File Scanner\Application
   
• Create the following value:
  
  "LogLevel"=dword:00000004
   
• Restart the Sophos File Scanner Service.

That said, files will still need to be touched on the drive for the scanner to know if the files are on the white list or if the files need to be scanned normally. 

You can also find some information on real-time scanning in the SSP Logs located in "C:\ProgramData\Sophos\Endpoint Defense\Logs\SSP.log". For this component you can turn on debug logging from the Endpoint Self Help Tool.

So even though c:\Windows\CCM is whitelisted, if something is added to a subdirectory in c:\windows\ccm it will still touch the file?

That's correct. All files will still be touched, but not all will be scanned if some are excluded. If you have a folder exclusion, the files and folders in all sub-directories will be excluded from scanning.

You can test if exclusions are working correctly by using an eicar file.