1. I received an excel file via email. 2. I opened it, worked on it extensively, saved it under another name. 3. I worked on it more, spanning several days. 4. It wasn't behaving 100% (scroll didn't work consistently), so I saved it as yet another name and closed it. 5. It is gone. No sign of it anywhere. 6. I am trying very hard not to freak out and have judiciously avoided using '!'s even if that is what I am thinking. 7. I think/hope where it saved it to is the key, because I did a 'Save As' and only paid attention to the file name. Thoughts? I am on a 2013 MBP with 16GB RAM. I am running Yosemite 10.10.1 Excel 2011 14.6.6 I have checked downloads, Finder, Excel recent and beyond, My Files, Desktop, My Documents.