No, Word and Excel started out on the Mac and came to Windows later. I think what you're referring to is, there was a deal in the '90s where Microsoft helped out Apple, which included investment and maintaining an Internet Explorer Mac port (this was a much bigger deal back then). This gave the company some breathing room. At the time Apple was circling the drain and everyone assumed that they would be out of business in a matter of years if not months. This was the same era as Microsoft's antitrust suits, so what Microsoft got out of it was a (very weak at the time) competitor that they could continue pointing to as evidence that they weren't a monopoly.