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 find the MAC address and other phone information of my Lumia phone?
- Why do I see 'Critical update' notification on my Lumia phone?
- Will I get “Hey Cortana” voice activation after Lumia Denim update?
- Which transfer methods does the Transfer my Data application support?
- I cannot download or get application updates when first starting the Store app on my Lumia. How can I resolve this issue?