From: Joel Pearson <lists@...>
Date: 2013-05-13T17:21:02+09:00
Subject: Re: Problem using display method with Outlook WIN32OLE

I remembered the word "singleton" and looked into it until I found a 
workaround.
Here's the solution (for posterity):

# New mail
m = outlook.CreateItem(0)

# Remove Object#display only for this instance
class << m
  undef display
end

# This now calls win32ole display correctly
m.display

# Extract the signature
signature = m.htmlbody

# Set the mail to use HTML
m.bodyformat = 2

# Set a custom mail body with the default signature
m.htmlBody = body + signature

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