Some people still use Outlook. And whenever they send you something like an attachment or appointment, it shows up in your Mail with a winmail.dat file attached. (Ugh.)

But Letter Opener seamlessly converts all types of Outlook’s irksome winmail.dat files. (Hooray!)

• Browser attachment of a winmail.dat file
• Displays nested messages
• Adds appointments directly to iCal
• Converts notes with incredible simplicity
• Creates contacts in Address Book
• Reads and delivers receipts