WinMail Decoder helps you view and extract the contents of winmail.dat files. Therefore, the tool may come in handy when you need to handle email messages created or sent with old versions of Microsoft Outlook. In this respect, this application solves the problem of accessing their contents and attachments, which is not very commonly supported by modern email clients running on macOS.
Fortunately, using the tool is anything but complicated. You are just prompted to drag and drop the intended DAT files and drop them onto its welcome screen. Another option is to browse for them in Finder. Good news is that you can process batches of files in a single operation. The contents of each file are almost immediately shown, with the possibility of previewing their attachments. Then, you can easily pick the items you want to export to disk. Likewise, it is allowed to use the contextual menu to copy them to the clipboard, ready to be pasted anywhere supported.
All in all, Winmail Decoder is perfect for overcoming compatibility issues between email file formats. Thus, it lets you avoid using a virtual machine instead. It is very light and has little demand of system resources. However, I regret saying that it froze once while I was trying to process several files. The product can be purchased from the Mac App Store.
