This is what you see when you try to join a Windows 10 client before you make the changes on the SBS 2011 Standard server. On the SBS 2011 server browse to C:\Program Files\Windows Small Business Server\Bin\WebApp\ClientDeployment\packageFiles. Open supportedOS.xml with Notepad++ ( https://notepad-plus-plus.org/ ). We will need to add two lines, one for 32 bit Windows 10 and one for 64 bit Windows 10. <OS id='9' Name='Windows 10, AMD64' Major='10' Minor='0' Build='10240' SPMajor='' SPMinor='' ExcludedSuite='512' RequiredSuite='' RequiredProductType='1' Architecture='9'/><OS id='10' Name='Windows 10, x86' Major='10' Minor='0' Build='10240' SPMajor='' SPMinor='' ExcludedSuite='512' RequiredSuite='' RequiredProductType='1' Architecture='0'/> As soon as you hit save you will see that Notepad++ informs you that it needs to restart in Administrator mode to be able to save the file. Click Yes. Click Yes to accept the UAC Click Save again and we are done. Now you can run Edge and go to http://connect to join the Windows 10 client Accept the UAC warning and lick Yes. I will setup this computer for myself as I am the administrator Good! Click Next Use the administrative credentials to setup this computer. You can change the name of this computer if you wish. We get a warning that settings and data cannot be moved. Read the link if you want to know more about this. Click Next. Restart Login with the admin credentials There we are! Our Windows 10 is joined to the SBS 2011 domain.