There is a rhyme and reason to Microsoft wanting your browser experience to be in Internet Explorer - it comes down to money.
When you use Internet Explorer, guess what your default search engine is? Microsoft’s Bing. By using Bing, you get to see Bing’s ads,. Microsoft likes that because they get additional ad revenue. Their overall search percentage goes up, so merchants are more likely to use the Microsoft Merchant Center (whose results are displayed on Bing), and generally Microsoft gets to be a bigger player.
IE is also optimized for other “paid” web-based products like SharePoint and Office365. If IE is widely used by the public in their private lives, it’s one less barrier in convincing corporate executives that using IE in conjunction with Microsoft’s paid web-based technologies is a good idea.
When using IE, Microsoft also pre-installs some Microsoft-Centric bookmarks that point you to Microsoft-owned sites.