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FYI: Microsoft is now rolling out Windows 10 nagware to non-WSUS-controlled business computers, in addition to home computers. Fortunately Microsoft also released a document for disabling the update notifications:
https://support.microsoft.com/en-us/kb/3080351
Two steps:
1. Disable the Win10 automatic upgrade
2. Disable the notification area icon & popup
How to manage the Windows 10 upgrade:
Hide the "Get Windows 10" app: (notification area icon)
https://support.microsoft.com/en-us/kb/3080351
Two steps:
1. Disable the Win10 automatic upgrade
2. Disable the notification area icon & popup
How to manage the Windows 10 upgrade:
Group Policy
Microsoft has released new updates to enable you to block upgrades to Windows 10 through Windows Update. These updates install a new Group Policy Setting. Computers that have this Group Policy Setting enabled will never detect, download, or install an upgrade to the latest version of Windows.
To obtain and install these updates, go to the following Microsoft Knowledge Base articles:
3065987 Windows Update Client for Windows 7 and Windows Server 2008 R2: July 2015
3065988 Windows Update Client for Windows 8.1 and Windows Server 2012 R2: July 2015
To configure this Group Policy Setting by using Group Policy, the following conditions apply:
The appropriate update must be installed.
You must use the updated WindowsUpdate.admx file by copying the file from the editing policy location.
Computer Configuration
To block the upgrade by using Computer Configuration, follow these steps:
Click Computer Configuration.
Click Policies.
Click Administrative Templates.
Click Windows Components.
Click Windows Update.
Double-click Turn off the upgrade to the latest version of Windows through Windows Update.
Click Enable.
Policy path: Computer Configuration / Administrative Templates / Windows Components / Windows Update Policy
Setting: Turn off the upgrade to the latest version of Windows through Windows Update
Windows registry
Important Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
To block the upgrade to Windows 10 through Windows Update, specify the following registry value:
Subkey: HKLM\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate
DWORD value: DisableOSUpgrade = 1
Hide the "Get Windows 10" app: (notification area icon)
For non-Enterprise versions of Windows, the notification icon can be suppressed through the Windows registry. To do this, set the following registry value:
Subkey: HKLM\Software\Policies\Microsoft\Windows\Gwx
DWORD value: DisableGwx = 1