Re: I for one
There's nothing wrong horribly with the Apple mail client. It just only allows you to use one mail account at a time (the same as Android).
Whereas Win Pho gives you a shortcut to each email account, which if the live tiles now work properly means can check each one at a glance.
The other problem with the Apple client is that you have to use the same button to change accounts as to access different mail folders within the same account. And it's pretty much random as to which on you get when you press the button. So you want to look in your sent items, you often have to select the mail account again, just in order to then be allowed access to a sub-folder!
I have 2 work accounts to juggle as well. Hence I set up the gmail app to separate out my personal mail.
Oh and while we're at it, the Apple addressbook is even shittier at handling multiple accounts. I want to display my personal and key work numbers, and not mix up with the 4,000 others. And then find those by searching. But Apple don't allow that. I've got to wade through thousands or manually change address books each time.
They basically don't seem to have recognised that a phone is for both work and personal use. Win Pho has the best email and address book, although the new Blackberry seems to be pretty good at this too.