I switched to Mac last month, coming from a PC Excel paradigm, and I am finding that most of the demanding tasks that I could do with PC Excel simply cause Mac Excel to crash. Like copy and paste a column with 10,000 cell simply locks up Mac Excel. Even saving a speadsheet with a lot (10,000) cells with formulas will cause it to freeze. This type of stuff I did all the time on the PC, so I am just looking to see if this is a fundamental flaw with Mac Excel. I haven't seem much discussion, which seems weird if it is a major flow.