bug: renaming an email account by only changing the case..
If you try to rename an email account, and only change the case of the letters, WP8 tells you another account with that name already exists.
It should just rename it.
Possibly the phone is considering the currently-being-edited account in the list of names
when it is looking for duplicates
Solutions to the Problem bug: renaming an email account by only changing the case..
I might try renaming with a different name THEN rename it the way you want it to appear,
If that does not work then I would suggest that you just delete the account then set it up again.
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