MS Office and Google Drive File Stream: Safe to edit

Google drive file stream  is now adding an real-time presence to your Microsoft Office documents.
In the bottom right corner of your documents you see a Safe to edit message to indicate no one else is working in the file.
You will also see who is editing and be able to merge after simultaneous editing.
You need to have the Drive File Stream Client installed for this feature to be active. Google is doing this without any Office plugin. When you launch the office document from your synced drive the Drive Client monitors it and displays the messages on top. Nice work Google!