If you are receiving the error 85050025 when syncing an Exchange or outlook account, deleting the account from the phone and then re-adding it has been reported as a possible fix. Under
Settings > Email + Accounts, tap and hold on the account then select
Delete. Once removed, tap the add an account
option then proceed to add it back.
I hope this information helps to address your issue. As always if you have any additional questions or concerns, please feel free to reply to this post and we'll be happy to assist.