I will troubleshoot and fix one Excel problem plus show you what I did so you can fix similar problems yourself in the future.
Matching, sorting, formulas, charts, pivot tables, lookups, arrays... as long as you can describe what you want, I'll help make it happen for you. I'm willing to sign non-disclosure or confidentiality agreements if your organization requires it.
I use both MS Excel 2010 for Windows and MS Excel 2011 for Mac. (Although the saved files are interchangeable, there are slight differences in how certain functions are handled when the files are open.)
You can also try Fiverr's "Request A Custom Order" button to describe what you need and I'll get back to you so we can discuss it.