Excel on OS X seems to have many problems with somewhat large xls(x) files. I know a project manager that had to switch back to Windows because of that. Office

Excel on OS X seems to have many problems with somewhat large xls(x) files. I know a project manager that had to switch back to Windows because of that. Office on OS X has always sucked. If it wasn't for Office's dominance on the Windows side, the product would have died a long time ago.