Are there any guidelines for applying Security Policy though GPO?
Yes, Microsoft has kindly provided us with the Windows 2003 Security Guide. This is very helpful for planning your security implementation and even provides some pre-configured security templates you can directly load into your Group Policy Object. Please see the following link for more information: http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/prodtech/win2003/w2003hg/sgch00.asp To import one of these templates into a GPO, right-click the GPO in the GPMC and select ‘edit’, open Computer Configuration/Windows Settings and right-click Security Settings. Select ‘Import Policy’ and browse to the downloaded ‘.inf’ template. (The templates are text files so can viewed using any text editor).