here is a script to read out the Office Version installed. Also shows which version of the .exe files are installed.
#include <File.au3>
Local $objFSO = ObjCreate("Scripting.FileSystemObject")
Local $WSHShell = ObjCreate("WScript.Shell")
$textout = ""
Dim $part[2][5] = [["Word","Excel","Outlook","PowerPoint","Access"],["WINWORD.EXE","EXCEL.EXE","OUTLOOK.EXE","POWERPNT.EXE","MSACCESS.EXE"]]
$textout = "Installierte Office-Anwendungen:" & @CRLF & @CRLF
ChkOffice("14.0","2013")