GSSAPI-based Kerberos authentication protocol is not offered to IMAP clients in Exchange Server 2013

Applies to: Exchange Server 2013 EnterpriseExchange Server 2013 Standard Edition

Cause


This issue occurs because Internet Mail Access Protocol (IMAP) does not support the generic security services application programming interface (GSSAPI) as an authentication mechanism in a Microsoft Exchange Server 2013 environment.

Resolution


To resolve this issue, install Cumulative Update 9 for Exchange Server 2013.

Status


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.