You've got Mail (problems), and we are working on it
Some of you have reported issues with syncing your Hotmail on your mobile using our latest Windows Live for Windows Mobile client. The error message reported on the client says: "There is a problem with the server. Please try again later."
We have investigated this issue and have identified the root cause. We are working hard towards a solution and will keep you updated on our progress. In the meantime, you can try the following work-around as suggested in our release notes:
Try moving messages out of your inbox (or folder that fails to sync.) into a different folder that is not being synced with your mobile, then try syncing on your mobile again.
We are aware that this issue causes a lot of pain to those affected by it. We apologize for the inconvenience and thank you for your continued support while we improve our service.