You mean you do not want to get the emails on your phone ?
If so.. go to settings-->email+accounts-->Microsoft Account and uncheck the Box against Email under Content to sync ..
Try and see if that is what you want ...
I bought lumia 520 seems okay but then realised once you access email you can't logout. For me this means to avoid this I can't add any appsor use the . phone to check email unless there is a way to force a logout withoutfactory reset. I must admit if I had known this I would not have bought,
I'm not really sure what the exact nature of your problem is but you need a Microsoft account setup on the phone to be able to access the store and download apps. The same account is also used to backup content on the phone to your MS account online such as contacts, pictures & videos (Skydrive), messages and applications list & data.
As Farby suggested, you can tell the phone not to sync emails from this MS account if you want but you cannot remove your MS account for the above stated reasons.