In theory the government (through antitrust activity) becomes the de facto authority on what can and cannot be included (ala bundled) in a package. So before the fall, AT&T was going to offer local/long distance, cable, and broadband service . . . but first they had to fight about opening their cable lines to competitors and federal limits on the percentage of cable subscribers they could service. If AT&T had the "opportunity" to roll out a nationwide network as opposed to piecemeal they could bring a service many people would want at a lower cost from a single provider. But gubment regulations are a disincentive to invest heavily b/c the return is arbitrarily limited.
M$ presents a similar argument. Word is just a word processor. Excel just a spreadsheet. Access just a database. Stick them together you've got a productivity suite. M$ has made your life easier by providing one-stop shopping for all your software needs. Hate learning how to use a new OS when changing jobs or going from home to work? Just buy M$ and you are guaranteed ease of use due to familiarity.
A better case is in the browser war. No one could have predicted the power/influence of the Internet. So what M$ came to the party late? So what their first product svcked? It was still free and it was integrated with the OS and the productivity software. Companies give people what they want and more. People will purchase the best/easy to use product. Gubment regulations weasel between that relationship and put up barriers to offering new products to the public. If there is limited opportunity for profit why bother investing in new technology . . . particularly if the gubment may make you give it to your competitors who didn't have the motivation to do it themselves.