Determine which edition of SharePoint is Installed

Question

What is the most reliable way to determine which version of SharePoint is installed. Whether it is WSS or MOSS. If MOSS, whether it is standard or enterprise.

I want to programmatically detect the exact SharePoint version installed..

PS: I already have posted this question at SharePoint.SE but could not find a convincing answer.

Answer 1

You could try to use SPFarm.Local.BuildVersion or SPWebService.ContentService.Farm.BuildVersion (from this previous question) and to build a lookup table based on this: How to find the level of SharePoint you are running?

Another option is to read directly from ConfigDB database, on Versions table; you can find more information here.

Answer 2

As suggested there, the probably most reliable method is to check for the availability of a feature. There is no function in the SharePoint API that can tell you if it's WSS, MOSS Standard, or MOSS Enterprise.

Answer 3

Registry keys on server

You can look for these within the registry key HKLM\SOFTWARE\Microsoft\Shared Tools\Web Server Extensions\14.0\WSS\InstalledProducts.

BEED1F75-C398-4447-AEF1-E66E1F0DF91E: SharePoint Foundation 2010 
1328E89E-7EC8-4F7E-809E-7E945796E511: Search Server Express 2010 
B2C0B444-3914-4ACB-A0B8-7CF50A8F7AA0: SharePoint Server 2010 Standard Trial  
3FDFBCC8-B3E4-4482-91FA-122C6432805C: SharePoint Server 2010 Standard  
88BED06D-8C6B-4E62-AB01-546D6005FE97: SharePoint Server 2010 Enterprise Trial
D5595F62-449B-4061-B0B2-0CBAD410BB51: SharePoint Server 2010 Enterprise  
BC4C1C97-9013-4033-A0DD-9DC9E6D6C887: Search Server 2010 Trial  
08460AA2-A176-442C-BDCA-26928704D80B: Search Server 2010  
84902853-59F6-4B20-BC7C-DE4F419FEFAD: Project Server 2010 Trial  
ED21638F-97FF-4A65-AD9B-6889B93065E2: Project Server 2010 
926E4E17-087B-47D1-8BD7-91A394BC6196: Office Web Companions 2010  

Programmatically

See the article How To: Detect the Installed SKU of SharePoint 2010 on MSDN. It has a list of GUIDs for each SKU:

PowerShell

You can also use the PowerShell command get-spfarm | select Products to output GUIDs for the installed SKUs.