In iOS it bugs me that I cannot open more than one email at a time. Often in need to c&p from several emails, or compare their wording. Open, search, copy, open, search, paste, open draft, gets tedious.
First, how do you do that in Windows Phone? I'm not aware of this feature.
In iOS 8, you can't open more than one email at a time to read. You can, however, open more than one at a time to compose or reply to. You can switch between them at the bottom of the mail app.
Here is what they look like collapsed.
Here is what it looks like when you tap one of the emails on the bottom to switch between them.
Also, i use folders and rules to manage my emails. In iOS i do not get any alert if a subfolder gets a new mail. Even more annoying: these folders are not synced, so I always have to play a few days catch-up when i do manually navigate into these folders (one folder gets 1000+ msges/day)
In iOS 7, go to your main mailbox list. This is where you see all your folders. Click Edit. Select 'Add mailbox' at the bottom of the list.
Then, choose the account that has the folder and then the folder(s) you want synced. Then hit done, done, done. That should put them in the main list. You should get push, count and notifications if they are selected here.
Less annoying, but still inconvenient : the red unread count stays even though i have been in the inbox and mentally registered that they are there( but determined that they are irrelevant or will be dealt with later). It gets confusing to identify at a glance if it is worth to look into the inbox "27 unread messages - that is unchanged from half an hour ago, or was it 24 mails then?"
I turn the badge off. Here is how I have my notification set up.
Show in NC is off
Badge App is off
Show on lock screen is on
Banner is selected as alert style
So that means that if my phone is off, I will get a notification of the email when I pick my phone up. It will be on the lock screen. Once I unlock my phone I do not then have to go and clear it out of the notification center nor will the badge show up.
If I am using my phone, I will get the banner alert at the top that an email has come in while I'm using whatever app.
I hope that helps.