Browser attachment of a winmail.dat file like other attachments
Most of the time you receive winmail.dat files from Microsoft Outlook users who send mails with attachments. You can try to convert these with other tools, but nothing is so seamles integrated into Apple Mail as Letter Opener.
Convert Schedules, Appointments and Task for iCal
Microsoft Outlook sends information of schedules also as plain text, but it is not very Mac-a-like to copy and past this into iCal. Letter Opener converts this for you so that it look like a schedule from another Mac user.
Convert Contacts for Address Book
Microsoft Outlook doesn't send any plain text information of the contact in the mail, so there is no way without Letter Opener to Get the contacts, unless the user exports a vCard.
Nested messages are mails including one or more messages. Microsoft Outlook also stores these messages as one winmail.dat file. Again, there is no way without Letter Opener.
Notes from Microsoft Outlook also get converted.
Receive information about the delivery status and the read status of a message.
When you start Apple Mail, Letter Opener checks for the latest available update. So you use always the latest version.
