Just two entries should manage the job:
- User Configuration\Administrative Templates\Windows Components\Internet Explorer: Turn Off Tab Browsing: DISABLED
- User Configuration\Administrative Templates\Control Panel\Display\Desktop Themes\Load a specific visual style or force Windows Classic: ENABLED (path to visual style left blank)
While I didn't test this, I have read that the following key:
- User Configuration\Administrati
ve Templates\Windows Components\Windows Explorer : Enable Classic Shell
Can cause tabbed browsing to fail despite the first two settings - use RSOP to check if it's on for your users...