Note: Mail Attachments Iconizer has been upgraded to Attachment Tamer. If you have a license for Iconizer, you can download Attachment Tamer as a free update.

Attachments called “winmail.dat” are sent by Microsoft Outlook and may contain calendar events, contacts, nested messages, or notes. With or without Iconizer, Apple Mail cannot display these attachments.

Letter Opener is a third-party plug-in that converts Microsoft Outlook's “winmail.dat” files on the fly, so you can actually see and use what the sender intended you to have. Iconizer and Letter Opener are compatible.