There are two way to check.first is you can directly check whether key contain A or not in binding like this:-. but i think this is not the better way so instead of this you can use ko.computed to check.
Check for operating system information in Windows 7. 1  Click the Start button , enter Computer in the search box, right-click Computer, and then click Properties. 2  Look under Windows edition for the version and edition of Windows that your PC is running.
2- Download Microsoft Office 365 Desktop app installer from here. 3- After downloading installer, open the setup file and it will ask to âRunâ the setup. 4- After clicking on âRunâ, it will download the desktop app. 5- When you are done with the downloading then sign into your Microsoft Online Services Account.