I have a Word DOCX file that uses the Calibri font. It has hairline spaces (unicode character 0x200A I think). It looks fine on my computer with Word 2007 on Windows 7, a coworker's Word 2010 on Mac OS X 10.7, and coworker friend's Word 2007 on Windows XP.
However, it just shows up as a weird square with a question mark in it on another coworker's computer, kind of like this: [?]. Since this coworker is the one in charge of publishing our documents as reports, I need to figure out how to fix it.