You may experience any of these problems:
This issue may be resolved by ensuring the host Exchange Server is updated with the latest updates and service packs. Check you are using Microsoft Exchange Server 2007 (or later), with Service Pack 2 (or later); you may need to contact your mail service administrator for assistance. If issues persist, contact Microsoft for support.
If the Microsoft Outlook app is installed on your phone, see My apps are not working for uninstall and reinstall instructions.
For further assistance with on syncing issues, see I receive error 85010014 or 0x85010014 when syncing with Outlook.