Hello. I just have released the first version of a new application in contrib, the Limits Application. This extension prevents the creation of too many users or wikis in an instance. It can also limits the number of members of any global group you want. The reason behind the creation of this application is the need, for XWiki hosters, to add some restrictions on their instances to save their resources. For example, a virtual machine handling a lot of users needs more memory: it's fair that the client pay more to push back these limits. See: http://extensions.xwiki.org/xwiki/bin/view/Extension/Limits+Application/ Thanks, -- Guillaume Delhumeau (guillaume.delhumeau(a)xwiki.com) Research & Development Engineer at XWiki SAS Committer on the XWiki.org project