EBS Management Server: Error "CAL product key entered is not valid"

You may receive an error (see pic) after you add the 25-character alpha-numeric product key using the “Add Cal Pack Keys Wizard” on the EBS console Licensing tab. The first thing to verify’s that you bought the licenses (Standard/Premium) for the right product. Note: Windows for Windows Essential Server 2008 (WinWess) and Windows Essential Business Server 2008 (WEBS 2008) are […]

You may receive an error (see pic) after you add the 25-character alpha-numeric product key using the “Add Cal Pack Keys Wizard” on the EBS console Licensing tab. The first thing to verify’s that you bought the licenses (Standard/Premium) for the right product. Note: Windows for Windows Essential Server 2008 (WinWess) and Windows Essential Business Server 2008 (WEBS 2008) are not same. Download the document which includes all the SKUs for Windows Essential Business Server 2008 and Windows for Windows Essential Server 2008 and their respective licenses. The definitive way to verify that you have acquired the correct SKU is to verify the part number from this document with your reseller.  EBS CALs are listed with a product name containing the string WinEssntlBsnssCALSte and have a part number starting with 6YA, while WinWess CALs contain the string WinSvrforWinEssntlSvr and have a part number starting with MYC.