Hi Kerberos.JK,
please refer to these 2 links for compatibility issues/features for CRM 2011 and Office 2013.
CRM Dynamics Compatibility list
http://support.microsoft.com/kb/2669061
Support with Microsoft Dynamics CRM 2011 and Microsoft Office 2013
http://support.microsoft.com/kb/2744957
Make sure your CRM deployment and Version of Office 2013 is supported within these posts.
Regards Gavin Higgins Windows/CRM infrastructure Consultant