We’ve had a lot of complaints from clients who have received attachments from users with Microsoft Office 2007 and have been unable to open them. It turns out that Microsoft changed the default file format in Office 2007 & that format is not compatible with any other version of Microsoft Office (both on a PC and a Mac). This is typically Microsoft – introduce something new that offers no advantages whatsoever & provide zero backwards compatibility within their own software families. Nice work, Microsoft!
Microsoft also learns from their mistakes (though they never admit it) & has released converters for both PCs and Macs to allow these new file formats (based on eXtensible Markup Language – suffix docx) to be opened properly. They’re available here: