"Sql server, Power PC, Office, Visio, All from microsoft"
I'm guessing you meant the "Powershell" shell software not the "Power PC" processor hardware architecture.
Anyhow, much of your list was bought from others not created or contributed by Microsoft. MS didn't contribute the product, they promoted it after others creation. It's proven a sound strategy when one's business is manufacturing profit margins; less successful if your goal is product quality.
Powershell seems a response to the shell on Unix like OS; I don't know it's development history well enough to say what code came from where. I do thank MS for a more capable shell, just wish it's scripting language was a little more like Bash scripting. If I wanted to write VC or C#, I'd use Visual Studio. Ideally, Powershell would have been CMD.com with it's scripting language improved a little not a Terminal window with over-engineered C# support.
I believe SQL server was bought and re-branded; again, don't know the history well enough to confirm. The major parts of Office are all based on bought and repackaged prior works. Visio was a solid and established application before MS bought out the company that produced it. MS Dos; bought and repackaged. Windows; stolen and repackaged. Windows network stack; BSD TCP/IP, your welcome.
Microsoft's real gift is knowing when to buy out a product just before it becomes to established or to competitive. Sadly, the software entrepreneur's wet dream remains creating something threatening enough to be bought out by Microsoft.
