Can’t Save Office File on Mac? Look for Forward Slash

Unlike in computing’s past, file names can have all kinds of characters in them nowadays. However, some characters still cause problems on certain operating systems. If you’re using a Mac and want to save an Office document, it won’t let you do so if the file name has a forward slash in it.

From Macworld:

This is a very, very, very long-running problem that seems to crop up only with Microsoft apps. Create a file in any other program, put a slash in its name, save it, open it, modify it, and save it again. OS X handles it just fine. Do the same with a Word, Excel, or PowerPoint document and you receive an error.

Just rename the file and you’re back in business.