ZCM install instructions I find this

"Your server might be capable of handling tasks in addition to the tasks a
Primary Server performs for ZENworks 10 Configuration Management.
However, we recommend that any server where you install the Primary Server
software be used only for ZENworks 10 Configuration Management purposes.
For example, you might not want the server to do the following:
.. Host Novell eDirectoryTM"

There are no reasons given? We are a small office, does this mean now I need two servers, if I want to run OES2 and ZCM?