This is a limitation inherent to Windows Phone 7.x devices, for example, Lumia 800. The Windows Phone 7 platform is capable of transferring only 500 messages.
- How do I remove my Lumia phone from the account settings at windowsphone.com?
- How can I transfer my contacts, messages, calendar entries or photos to my Lumia?
- I cannot end a call because my Lumia screen remains black
- My phone does not charge
- I cannot download or update apps from Store on my Lumia. How can I resolve this issue?