Are you a Hotmail user? I have had an account since … forever. And while it hasn’t been my primary email since … well, since I signed up for Yahoo mail around the same time, it is an account that I have maintained and used for a variety of specific purposes through the years.
I have found the Hotmail implementation on iOS to be adequate but not outstanding, although it is better than the native support on Android in my experience. But as I reported last fall Microsoft released a native Hotmail app for Android, and it is actually pretty good, featuring push support and a decent interface.
Now Microsoft has released Hotmail on the Amazon Appstore for Android with full support for the Kindle Fire. Based on using it just for today, it is just as solid as the normal Android version!