What is the ProgID of Thunderbird?

Hello to everyone, a quick question...

The below code works fine with Outlook but  I  would need to work with  
Thunderbird.
I think I should change the ProgID from 'Outlook.Application' to the 
Thunderbird one, but I do not know what it is!

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function sendEmailWithOutlook(emailAddress, subjectText, bodyText, Attach)
% sendEmailWithOutlook - Functions sends email to an email address,
% Microsoft Outlook has to be installed.
% emailAddress: Email address of the recipient
% subjectText: Message displayed in the subject line
% bodyText: Message displayed in the body of the email
% Attach: Path of Attachments
% Calling the function:
% sendEmailWithOutlook('[email protected]', 'Testmail', 'This is a test!', 
'c:\test.txt')
% It's possible to send without an attachment, then call function like 
this:
% sendEmailWithOutlook('[email protected]', 'Testmail', 'This is a test!', 0)
% To have more than one recipient or attachment, use cell arrays like this:
% sendEmailWithOutlook({'[email protected]', '[email protected]'}, 
'Testmail', 'This is a test!', {'c:\test.txt', 'D:\Test\readme.doc'} )
% Function was tested with Matlab 6.5 R13 on Windows XP Prof.
% with Outlook 2002
% Author: Rainer F., [email protected], Feb. 2004

outlook = actxserver('Outlook.Application');
email = outlook.CreateItem(0);
if (iscell(emailAddress) == 1)
  tmpSize = size(emailAddress);
  for i = 1:tmpSize(2)
      tmp = cell2mat(emailAddress(i));
      email.Recipients.Add(tmp);
  end
else
  email.Recipients.Add(emailAddress);
end
 email.Subject = subjectText;
email.Body = bodyText;

if (iscell(Attach) == 1)
  tmpSize = size(Attach);
  for i = 1:tmpSize(2)
      tmp = cell2mat(Attach(i));
      email.Attachments.Add(tmp);
  end
else
  if (Attach ~= 0)
      email.Attachments.Add(Attach);
  end
end

email.Send;

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Thanks Thanks