First of all, check whether the inventory NDI file gathered from your computer with Exchange Server installed show the edition information. Open the NDI file in a text editor, and look for information like the following:
<Package Name="Microsoft Exchange Server 2013 Cumulative Update 23 Enterprise" Version="15.0.1497.2" Evidence="MSI">
<Property Name="Edition" Value="Enterprise"/>
<Property Name="Publisher" Value="Microsoft Corporation"/>
<Property Name="InstalledProductName" Value="Microsoft Exchange Server 2013 Cumulative Update 23 Enterprise"/>
</Package>
If the agent is failing to identify the edition then you will likely see something like the following in the file:
<Package Name="Microsoft Exchange Server 2013 Unknown Edition" Version="15.0.516.32" Evidence="MSI">
<Property Name="Edition" Value="Unknown Edition"/>
<Property Name="Publisher" Value="Microsoft Corporation"/>
<Property Name="InstalledProductName" Value="Microsoft Exchange Server 2013 Unknown Edition"/>
</Package>
If you see content like the 2nd example (i.e. "Unknown Edition") then that suggests the specialized techniques the agent uses to identify the edition are not working for this particular installation. The attached VBscript replicates similar logic to what is used by the agent - try running this on the computer and check whether the output gives any indication of what is going on.
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