Disable autoupdate in thunderbird

thunderbird.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <packages>
 
-<package id="thunderbird" name="Mozilla Thunderbird" revision="%version%.1" reboot="false" priority="0">
+<package id="thunderbird" name="Mozilla Thunderbird" revision="%version%.2" reboot="false" priority="0">
 
 	<!-- NB: we've had problems with major version bumps which sometimes change the format of options
 			 we add in chemistry-prefs.js. Thus, we tie that to a version, and please test carefully when
@@ -16,6 +16,7 @@
   <install cmd='cmd /c copy "%software%\thunderbird\chemistry-prefs.js-%prefsversion%" "%programfileswpkg%\mozilla thunderbird\defaults\pref\chemistry-prefs.js" '/>
   <install cmd='cmd /c copy "%software%\thunderbird\cam.ac.uk.xml" "%programfileswpkg%\mozilla thunderbird\isp\cam.ac.uk.xml" '/>
   <install cmd='%software%\wpkg\tools\copydir.cmd "%software%\thunderbird\dictionaries" "%programfileswpkg%\mozilla thunderbird\dictionaries"' />
+  <install cmd='reg add HKLM\SOFTWARE\Policies\Mozilla\Thunderbird /t reg_dword /v DisableAppUpdate /d 1 /f'/>
 
   <!-- although an in-place upgrade works, Thunderbird then insists on a reboot
        the next time one tries to start Thunderbird -->
@@ -35,6 +36,7 @@
   <remove cmd='cmd /c %software%\wpkg\tools\waitforprocess.cmd Au_.exe' />
   <remove cmd='"%programfileswpkg%\Mozilla Thunderbird\uninstall\helper.exe" /S' />
   <remove cmd='cmd /c %software%\wpkg\tools\waitforprocess.cmd Au_.exe' />
+  <remove cmd='reg delete HKLM\SOFTWARE\Policies\Mozilla\Thunderbird /v DisableAppUpdate /f'/>
 
 </package>
 </packages>