The mailbox may have some emails with an excessively long subject line that are not supported by Windows Phone 8. Once you have removed the suspect mail item (i.e. cleaned the mailbox or move the suspect mail to a folder that phone does not sync) the error will cease.
- My Lumia phone does not work or respond as expected
- My Lumia stays at the spinning gears, how do I get it to stop?
- I cannot make a call on my Lumia phone
- I cannot share my Lumia’s internet connection with another device
- What can I do if get an error while trying to login to the mail account on my Nokia Lumia?