Editions, Licenses & Versions of MOSS 2007 and SharePoint 2010

https://spsfarmreport.codeplex.com/

SPS Farm Report in the codeplex is the Awesome Tool to get the Farm Config, Servers in farm, Shared Service Providers and Web Application details.
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EDITIONS

How to Find the Edition of SharePoint 2010 that is Installed.

To know if it is Standard or Enterprise version of SPS 2010, Go to the Central administration -> Upgrade and Migration-> Enable Enterprise features.  This will show you whether it is standard or enterprise.

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To know if it is Standard or Enterprise version of MOSS 2007, Go to the Central administration -> Operations-> Enable Enterprise features.  This will show you whether it is standard or enterprise.

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VERSIONS

MOSS 2007: In Central Admin, look at the Servers in Farm as it will tell you what version you have running. 

Central Administration > Operations > Servers in Farm  

SPS 2010: In Central Admin, look at the Servers in Farm as it will tell you what version you have running. 

Central Administration > System Settings > Servers in Farm  

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LICENSES

MOSS 2007: To determine whether you are running Standard or Enterprise, you can look in Central Administration where you would convert the current license.

1. Central Administration > Operations > Convert License Type   

SPS 2010: To determine whether you are running Standard or Enterprise, you can look in Central Administration where you would convert the current license.

1. Central Administration > Upgrade and Migration > Convert farm license type