Quit Adding and Fix what you currently have.
A mail program that works. No extra BS that no one uses, just a simple mail program that is easily maintained and does not take 30 thousand rules to make it keep garbage and other emails out of my daily views. Not to mention a program that is smart enough to clean up after itself. I am sick of running out of both physical and mailbox space because this bloated program cannot manage itself. Instead of popping up a message telling me I've run out of space, give me an option to clean up that space. Currently none of the options available have actually give me any extra space. So they DO NOT WORK; fix them.
Roxanne Constantin commented
IDEA: stop adding unwanted garbage to Office and fix your bugs instead. I haven't been able to use Math AutoCorrect in OneNote for years. It's a known bug, and what are you doing about it? FIX. IT. Fix your buggy products, then we'll talk.