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.
- What is the Lumia Video Trimmer app on Lumia phone?
- What can I do with the Lumia Video Trimmer app on my Lumia phone?
- Why can't I cut video clips exactly where I want with Lumia Video Trimmer?
- What kinds of videos can I trim on my Lumia phone?
- Where can I find the trimmed and saved video clips on my Lumia?