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.
- Can I zoom the images with PhotoBeamer app?
- What should I check if push notifications for XYZ third party apps not coming or coming late after Lumia Cyan update?
- Why do I get error "Video could not be decoded" when streaming video from YouTube?
- What can I do if the camera on my Lumia phone does not work properly?
- My Lumia does not start up