How to Send Attachments from OUTLOOK to a MAC

If you send an attachment on an e-mail and the recipient claims that they cannot open it, or they only have a .DAT file, here is what to do.

Find “format text” and change it FROM rich text to plain text or HTML text. This will solve it.

For the recipient who does not feel comfortable asking the sender to change their settings, there is an online DAT extractor.