Just to let you know Exchange 2013 CU8 has been released 
You can download the rollup from http://www.microsoft.com/en-us/download/details.aspx?id=46373
CU8 contains the following fixes (Referenced from https://support.microsoft.com/en-gb/kb/3030080)
- KB3045301 – SMTP is not transported over TLS 1.1 or TLS 1.2 protocol in an Exchange Server 2013 environment
- KB3040681 – MapiExceptionTimeout error during a hierarchy synchronization process of multiple public folders in Exchange Server 2013
- KB3037417 – Outlook cannot download an OAB file in an Exchange Server 2013 environment that mixes Exchange Server 2010
- KB3037291 – Can’t add members to Outlook contact group by using MAPI over HTTP
- KB3036952 – Mailbox quota warning messages are not sent out after you migrate from Exchange Server 2010 to Exchange Server 2013
- KB3036374 – Incorrect NDR size limit message is displayed for German localization in an Exchange Server 2013 environment
- KB3036365 – “The specified address is not recognized or does not exist” error message in an Exchange Server 2013 environment
- KB3032153 – Recurring events in Calendar over DST are not adjusted on all ActiveSync devices in all Exchange Server environments
- KB3031133 – Default folders are duplicated after you migrate mailboxes to Exchange Server 2013
- KB3031069 – Mails are spoofed in Office 365 or in an Exchange Server 2013 environment
- KB3030629 – Outlook cannot open a shared folder on which a group you attend has the Reviewer permission in Exchange Server 2013
- KB3018518 – Garbled text in the Japanese “From” field in a forwarded DBCS message
- KB3016440 – Public folder mailbox quarantined
- KB3012266 – Update to increase availability address spaces to 200 in Exchange Server 2013
- KB3011579 – SaveChanges fails and generates a MAPI_E_NOT_FOUND error message on a large message body in Exchange 2013 CU6
- KB3006861 – “The SMTP address has no mailbox associated with it” error when you access a user’s mailbox by using EWS application
- KB3003974 – Improved support for MSG files in an Exchange Server 2013 environment where OPENTEXT products are used
- KB2988060 – Cannot see the auditing results for an HttpModule-based extension for MAPI over HTTP protocol in Exchange Server 2013
- KB2986941 – “An Active Directory error 0x51 occurred” error when you run the “Setup /PrepareAD” command from a DC in Exchange 2013
- KB2961741 – Exchange Server 2013 delegated setup fails when the setup account is a member of Domain Admins
