I am working as a consultant on a project where we have a variety of computers and versions of Office running. I recently created a spreadsheet to track our work and placed it on the shared drive that was set up for us. I created the spreadsheet on my PC using 365 Home. The spreadsheet seems to work fine for everybody except one colleague who is using 365 Home for Mac, and of course is one of the main people who needs to use this file. When he tries to open the spreadsheet, the program spends several minutes trying to load it, then Excel crashes with an error stating that it was unable to open the file. The spreadsheet has three sheets with a vlookup function between two of the sheets and an index-match between two sheets as well. I made sure that there are no database relationships between the sheets as I read that the Mac version doesn't have that capability. Any other reason people can think of why the file won't open for that person?