Closes all open applications, quits Microsoft Windows, and logs the current user off. This method doesn't save changes to open Word documents; however, it does prompt you to save changes to open documents in other Windows-based applications.
expression.ExitWindows
expression Required. An expression that returns a Tasks object.
Example
This example saves all open Word documents, quits Word, and then quits Microsoft Windows.
Documents.Save NoPrompt:=True, _
OriginalFormat:=wdOriginalDocumentFormat
Tasks.ExitWindows