I'd say the biggest difference between Google and Microsoft would be in the arena in which they play.
Google has everything on the web. They can change whatever they want whenever they want and since it is web-based, you will have no option but adopt to whatever changes they have decided they want to go trough with. If they decide to obsolete a product, you no longer have access to it. You're pretty much on your own when it comes to replacing whatever you just lost.
With Microsoft it's all on your server. If they decide to change, alter or obsolete anything, it's up to you to keep up with them. If you don't approve of changes, you can remain on the platform you are currently running, if that makes you happy. While not free of risk, it at least lets you remain in control of what you are running.
In short, depending on either of them involves risks, and what you consider to be least acceptable is entirely up to you, your business and your priorities.
Google has everything on the web. They can change whatever they want whenever they want and since it is web-based, you will have no option but adopt to whatever changes they have decided they want to go trough with. If they decide to obsolete a product, you no longer have access to it. You're pretty much on your own when it comes to replacing whatever you just lost.
With Microsoft it's all on your server. If they decide to change, alter or obsolete anything, it's up to you to keep up with them. If you don't approve of changes, you can remain on the platform you are currently running, if that makes you happy. While not free of risk, it at least lets you remain in control of what you are running.
In short, depending on either of them involves risks, and what you consider to be least acceptable is entirely up to you, your business and your priorities.