Final answer:
Microsoft's main business involves developing computer software, facing legal challenges over antitrust issues, and utilizing successful product bundling strategies.
Explanation:
The main business of Microsoft involves developing computer software. Microsoft is primarily known for its software products such as Windows operating system, Microsoft Office suite, and development tools like Visual Studio.
Microsoft has been involved in legal battles concerning antitrust issues related to its dominant position in the software market and business practices like product bundling and predatory pricing.
One successful example of Microsoft's product bundling strategy is Microsoft Office, where multiple software products were bundled together, leading to market dominance.
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