* Microsoft Exchange 2013 Servers hosting only the Exchange CAS role are not supported
** Windows Server 2008 Server Core and Windows Server 2008 R2 Server Core not supported
*** Exchange 2007 CCR clustering requires Windows Server 2003 R2 or later
**** Microsoft Exchange 2013 with SP1 requires the application of a Microsoft patch before PureMessage for Exchange is installed. See article 120711.
*^ Exchange 2003 is supported on Puremessage 3.1.3 only when running Server 2003
System requirements for all Sophos products
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