• Update Rollup 5 for Exchange Server 2010 Service Pack 3
• Update Rollup 13 for Exchange Server 2007 Service Pack 3

Exchange Server 2010 Service Pack 3 Update Rollup 5 resolves customer reported issues and includes previously released security bulletins for Exchange Server 2010 Service Pack 3. A complete list of the issues resolved in this rollup is available in KB2917508.

Exchange Server 2007 Service Pack 3 Update Rollup 13 provides recent DST changes and adds the ability to publish a 2007 Edge Server from Exchange Server 2013. Update Rollup 13 also contains all previously released security bulletins and fixes and updates for Exchange Server 2007 Service Pack 3. More information on this rollup is available in KB2917522.

http://social.technet.microsoft.com/wiki/contents/articles/23142.introduction-to-the-dirsync-toolbox.aspx

And, we will continue with our on-premises releases of both SharePoint Server and Exchange Server on our traditional 2-3 year release cadence.  We’ll also continue supporting hybrid deployments spanning both cloud and on prem technologies.

http://blogs.office.com/2014/02/17/transforming-work-transforming-office/

Exchange 2013 SP1 is expected to have a new protocol implementation called MapiHttp. To help you understand this better at this stage, Joe Warren, Principal Software Developer, delivered a presentation covering the Exchange 2013 MAPIHttp protocol implementation and answered some questions.

You can view and download the presentation from here.