BlackBerry Enterprise Server software version 4.1.4 and later are tested and certified with the Windows Server 2003 64-bit operating system. Earlier versions of BlackBerry Enterprise Server are not certified with Windows Server 2003 64-bit.

BlackBerry Enterprise Server for IBM Lotus Domino

BlackBerry Enterprise Server software version 4.1.4 for IBM Lotus Domino or later can be installed on a Windows Server 2003 64-bit operating system; however, the computer hosting the associated IBM Lotus Domino messaging server must use the 32-bit version.

Note: Exchange System Manager 2000 or 2003 cannot be installed on a Windows Server 2003 64-bit operating system. The only software capable of providing the Messaging Application Programming Interface (MAPI) subsystem is the MAPI CDO client available from Microsoft.