Before you install GroupWise Client, Windows Messaging System must be installed. Windows Messaging System provides the MAPI ...

Before you install GroupWise Client, Windows Messaging System must be installed. Windows Messaging System provides the MAPI components that GroupWise Client requires. If GroupWise Client Setup does not detect an existing installation of Windows Messaging System, it attempts to install an earlier version. This earlier version of the Group Wise Client is incompatible with this version of Windows and results in a failed installation for both Windows Messaging System and GroupWise Client. This issue affects GroupWise versions 5.5 and earlier with this version of Windows. For a compatible version of Windows Messaging System, see the Novell support site.