This move is reeks of desperation.
Throwing money at a problem, when has that ever worked, microsoft??
A lot, it's kind of how they became what they are now. Their business software suite is almost entirely built using acquired software and the Xbox division was born from the purchase of studios.
Microsoft paid to license Mac OS, then paid engineers to reverse-engineer it and released Windows which destroyed Apple and became a PC fixture for 3 decades and counting.
July 1987 - Forethought's software for 14 million which was renamed Powerpoint. A couple businesses use it.
Dec 1997 - Hotmail for 500 million. Now called Outlook. A few businesses use this as well.
Jan 2000 - Visio for 1.25 billion. Currently Dynamics 365, part of the Office 365 suite. Again, a couple businesses use this software.
Jun 2000 - Bungie. Halo was massive.
Sep 2002 - Rare for 375 million.
Aug 2007 - Advertising agency aQuantive for 6.3 billion. In-house world leading advertising is a very long-term investment.
Apr 2008 - Fast Search & Transfer for 1.2 billion to boost it's search technology.
May 2011 - Skype for 8.5 billion.
Sep 2013 - Nokia for 7.2 billion
Nov 2014 - Mojang for 2.5 billion. I think I know a few people that play this.
Oct 2015 - Havok physics engine. This one was a fun time on GAF people were losing their minds.
Dec 2016 - Linkedin for 26.5 billion.
Now look at Azure. How much do you think that cost to build? It currently costs over 10 billion a year to maintain it and it's still profitable.
Not every purchase ended up being profitable, but obviously they are willing to take chances on properties and ventures as shown by their past acquisitions. The ones that don't work are absorbed as a cost of operating, and the long term investments are left to mature.