My current requires nested sub webs to have a specific language/regional setting. The problem arose when I started changing the Regional Settings from English (US) to English (Australia). $web = Get-SPWeb $siteCollectionUrl $culture=[System.Globalization.CultureInfo]::CreateSpecificCulture("en-AU") $web.Locale=$culture $web.Update() OR myWeb.Locale = System.Globalization.CultureInfo.CreateSpecificCulture("en-AU"); However, this started to cause problems when users started to create their nested webs. I was using the following C# code to create the webs: var newWeb = web.Webs.Add("Name","Title", "My Web", site.RootWeb.RegionalSettings.LocaleId , webTemplate, false, false); The locale I was referencing (3081) is not installed on the server - only the default 1033. It was trying to create new the site using the regional settings I had set previously. This was a bit of a problem: I need to create the site and ens...