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.
- Does the Lumia Share app work on all Lumia phones?
- The timeline is empty on my Story in Storyteller. What can I do?
- Why do I see the 'First Time Use' wizard again after updating Storyteller?
- How can I share my stories with Storyteller on my Lumia phone?
- What are the other icons I see on the map in the Storyteller app?