My win 8 phone does exactly this thing we are asking about. You have a mail hub with all of your accounts in it and can combine some or all of them or separate each of them into their own inbox using their own icon. Very handy.
It drives me crazy to see a sudden 734 on the icon, when none of them have anything to do with work.
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WP8 takes it a step further and allows you to create live tiles for individual folders within an email account. This is the greatest feature I have ever seen on a smart phone and what keeps me going back to Windows Phone. As an IT Manager, the ability to see an email notification for individual folders has increased my productivity and ability to respond to emergencies like server failures, service outages, etc. For someone that has never seen this, WP8 gives you an unread count since you last opened an email folder. ALl you have to do is setup a rule in outlook to have it send messages from services and servers to the folders and then create a live tile for those folders. Every time I glance at my phone I know if I got a new email to a folder and since the live tile is named based on the folder I know what server or service sent it. I can take immediate action. The alternative on Android, Blackberry, and IOS is to have one folder for email and if you're lucky one for each account. The unread marker is usually a dot that doesn't necessarily mean you have a new message since you last checked, just that you have unread messages so you have to actually open the folder to see if new mail has arrived. The worse part is getting to a folder - you have to drill down from Inbox, find the folder and see if it has any new messages.
WP8 has taken a 5 minute ordeal into a simple glance.
There are some very nice Android phones out , but the email functionality isn't smart at all.
I had high hopes for the HTC One with BlinkFeed, but the more I read about it the more it sounds like an RSS reader.