Excel 2010: Workbook Not Visible

I was working on an Excel spreadsheet this afternoon. I needed to create a new spreadsheet and keep the current one open. For some reason, after I created a new file, I can not view the original file that I worked on. I tried to close every file and re-open the original file, it did not help. I first thought the workbook was minimize or hidden, but they were not the cause.

After fiddling around with the menu, I finally got it to show up again. Here is what I did:

  1. Click on View.
  2. Click on New Windows.

Afterwards, I was able to see my workbook again.