Workaround: Command (send to > Mail recipient or File > Send as attachment) might not work when Outlook 2007 / 2010 is running and installed side-by-side with Outlook 2013

When Outlook 2007 or Outlook 2010 is running and installed side-by-side with Outlook 2013, Outlook shows the following message when you click Send To > Mail Recipient in Windows Explorer or click File > Send As Attachment in another program: This action is not supported while an older version of Outlook is running In order…