Have you ever wondered which sharepoint version you are using? You might know that you are using, let’s say, MOSS 2007, but not sure about the installed version of MOSS 2007. Maybe you want to check if service packs were installed on sharepoint. Here’s the way to do it:
Go to Control Panel -> Add and Remove Programs. Select the product (sharepoint server) and then click: Click here for support
Now a window will pop up that displays your current sharepoint version.