Thanks for contacting JustAnswer -- this is Seth, a JA tech expert.
Can you clarify? I'm a little unclear -- it sounds like you're asking two separate (unrelated??) questions:
1) You want to know whether you should upgrade Excel for Mac 2011 to a newer version of Excel for Mac -- is that right?
2) You also want to know how to get some rows to either a) wrap in the cell, and/or b) expand run across multiple columns/headings.
Am I understanding both your two questions accurately and completely?