function upgradeCleanup()
{
  // Obsolete files and generated files that
  // need to be cleaned up.
  deleteThisFile("Program",    "msgMapi.dll");
  deleteThisFile("Components", "signed.dll");
  deleteThisFile("Components", "smimestb.dll");
  deleteThisFile("Components", "nsMapiRegistry.dll");
  deleteThisFile("Components", "absyncsv.dll");

  deleteThisFile("Components", "addrbook.xpt");
  deleteThisFile("Components", "impComm4xMail.xpt");
  deleteThisFile("Components", "import.xpt");
  deleteThisFile("Components", "mailnews.xpt");
  deleteThisFile("Components", "mailview.xpt");
  deleteThisFile("Components", "mime.xpt");
  deleteThisFile("Components", "msgbase.xpt");
  deleteThisFile("Components", "msgcompose.xpt");
  deleteThisFile("Components", "msgdb.xpt");
  deleteThisFile("Components", "msgimap.xpt");
  deleteThisFile("Components", "msglocal.xpt");
  deleteThisFile("Components", "msgnews.xpt");
  deleteThisFile("Components", "msgsearch.xpt");
  deleteThisFile("Components", "msgsmime.xpt");
}

// main
var srDest;
var err;
var fProgram;

srDest = $SpaceRequired$:bin;
err    = initInstall("SeaMonkey Mail", "Mail", "$Version$"); 
logComment("initInstall: " + err);

fProgram = getFolder("Program");
logComment("fProgram: " + fProgram);

if(verifyDiskSpace(fProgram, srDest))
{
  setPackageFolder(fProgram);

  upgradeCleanup();
  err = addDirectory("",
                     "$Version$",
                     "bin",              // dir name in jar to extract 
                     fProgram,           // Where to put this file (Returned from GetFolder) 
                     "",                 // subdir name to create relative to fProgram
                     true);              // Force Flag 
  logComment("addDirectory() returned: " + err);

  // check return value
  if( err == SUCCESS )
  {
    // register chrome
    registerChrome(CONTENT | DELAYED_CHROME, 
                   getFolder("Chrome","messenger.jar"),
                   "content/messenger/");
    registerChrome(CONTENT | DELAYED_CHROME,
                   getFolder("Chrome","messenger.jar"),
                   "content/messenger-region/");
    registerChrome(CONTENT | DELAYED_CHROME,
                   getFolder("Chrome","messenger.jar"),
                   "content/messenger-smime/");
    registerChrome(CONTENT | DELAYED_CHROME,
                   getFolder("Chrome","messenger.jar"),
                   "content/messenger-mdn/");
    registerChrome(CONTENT | DELAYED_CHROME,
                   getFolder("Chrome","messenger.jar"),
                   "content/messenger-views/");

    // check return value
    err = getLastError();
    if(err == SUCCESS)
    {
      err = performInstall(); 
      logComment("performInstall() returned: " + err);
    }
    else
      cancelInstall(err);
  }
  else
    cancelInstall(err);
}
else
  cancelInstall(INSUFFICIENT_DISK_SPACE);

// end main