Well, I understand what you are saying and I agree that you are one of many, but I disagree with your analysis. I use mostly Microsoft technology and most of what I use is open source, from .NET to C# to NuGet to many, many frameworks. I am very oriented toward open source and very comfortable in the .NET world. It's very similar situation to a Mac user.
As far as storing data I also have my "own cloud" and I also use Dropbox and SkyDrive. I like all of the above and I find Dropbox extremely convenient. However, I do have a concern that Dropbox is not as secure as SkyDrive.
I use OneNote on my Nokia 925 Windows Phone, my Surface Pro, my laptop, and my workstation. All the data is synced in SkyDrive. I've got a lot of data. Global search is instantaneous. The application is extremely reliable. I save cut and paste snippets from the web. Stack Overflow answers with my personal annotations; anything. Images and sound files are extremely easy. I can record a meeting and take a few notes (by typing or using the stylus on the Surface) and later I can search on the string to find the note. If that note was taken 40 minutes into a 60 minute meeting I can click and get the .wav file to play that bit of the meeting. You can use OneNote on the other platforms as described in this article.
I'm not shilling for the Redmond entity but I always do find it hilarious that a very superior software product can hide in plain view and all the "think different" people can't even see it.