Make Outlook Web Access Your Default Mailer

  1. Add the following to a .reg file (don’t forget to edit the location of the Exchange server)

    Windows Registry Editor Version 5.00

    @="Outlook Web Access"

    @="\"C:\\Program Files\\Internet Explorer\\iexplore.exe\" http://server/exchange/alias/"
  2. Import it into the registry by double-clicking the .reg file (Please know that mucking with the registry is potentially dangerous and can make your system unstable).
  3. Boot IE
  4. Go to IE’s Tools / Options… Programs tab
  5. Choose “Outlook Web Access” from the E-mail dropdown.
  6. Hit OK.