I know this on a PC. It is Alt+O,C,A, as explained in this question.
Can someone tell me please what the keyboard shortcut is to fit the column width to the width of the text in Excel on a Mac?
I'm using the 2011 version.
Although Microsoft did not include many keyboard shortcuts in their Office Suite for Mac, you can make your own for any app including Office apps. To do so:
In this case you must type in
You can choose any key combination that suits your fancy.