Microsoft has released Cumulative Update 9 for Exchange Server 2013.
From the Microsoft Exchange Team blog:
Cumulative Update 9 contains the latest set of fixes and builds upon Exchange Server 2013 Cumulative Update 8. The release includes fixes for customer reported issues, minor product enhancements and previously released security bulletins. A complete list of customer reported issues resolved can be found in Knowledge Base Article KB3049849. Customers running any previous release of Exchange Server 2013 can move directly to Cumulative Update 9 today. Customers deploying Exchange Server 2013 for the first time may skip previous releases and start their deployment with Cumulative Update 9 directly.
A long-awaited feature that is included in Cumulative Update 9 is the ability to configure sent items behavior for shared mailboxes in Exchange Server 2013, so that a copy of items sent as or on behalf of a shared mailbox are stored in the shared mailbox’s Sent Items folder. This feature has been available for quite some time in Exchange Server 2010 and is also available in Office 365.
Cumulative Update 9 is available for download here.
For deployment steps refer to this guide to installing cumulative updates for Exchange Server 2013.
Note: If you have deployed CU9 and do not have the new Set-Mailbox cmdlet parameters for configuring sent items behavior you will need to run “Setup /PrepareAD /IAcceptExchangeServerLicenseTerms” from the CU9 source manually.