The April 2013 version of the Microsoft Exchange Server 2013 Help file is now available to download.
Overview
This download contains the Help content for Microsoft Exchange Server 2013 Hybrid Deployments and Cumulative Update 1 of Microsoft Exchange Server 2013.
System requirements
Supported operating systems: Windows 7, Windows 8, Windows Server 2008 R2 Datacenter, Windows Server 2008 R2 Enterprise, Windows Server 2008 R2 for Itanium-based Systems, Windows Server 2008 R2 Foundation, Windows Server 2008 R2 SP1, Windows Server 2008 R2 Standard, Windows Server 2008 Service Pack 2, Windows Server 2012, Windows Vista, Windows XP