Hello, My internet host asking me some question about it. If you can help me to answer. :-) There are some duplicate libraries in ./WEB-INF/lib: - /WEB-INF/lib/antlr-2.7.6.jar /WEB-INF/lib/antlr-runtime-3.5.jar - commons-lang-2.6.jar commons-lang3-3.3.1.jar - jdom-1.1.3.jar jdom2-2.0.5.jar - xwiki-rendering-syntax-markdown10-6.0.jar xwiki-rendering-syntax-markdown11-6.0.jar - xwiki-rendering-syntax-xwiki10-6.0.jar xwiki-rendering-syntax-xwiki20-6.0.jar xwiki-rendering-syntax-xwiki21-6.0.jar Can I delete old versions? I'm not sure about xwiki-rendering-syntax*: Xwiki 6.2 use some document with xwiki 1.0 syntax? We found this old libraries: /WEB-INF/lib/struts-core-1.3.10.jar but Struts 1 has reached its end of life and is no longer officially supported (since 2013). Cf.: http://struts.apache.org/struts1eol-announcement.html Will you replace this framework with 2.x version? There are this empty files: - /resources/js/xwiki/wysiwyg/tinymce/tiny_mce/plugins/inlinepopups/readme.txt - /resources/js/xwiki/wysiwyg/tinymce/tiny_mce/plugins/cleanup/editor_plugin_src.js - /resources/js/xwiki/wysiwyg/tinymce/tiny_mce/plugins/cleanup/editor_plugin.js I suppose I (you) can delete them? This file seems to be not stored at its place (/WEB-INF/lib): - /resources/js/smartclient/system/helpers/isomorphic_applets.jar Can I (you) store it in (/WEB-INF/lib) subdirectory? This libraries are not necessary on Tomcat server: - ./WEB-INF/lib/jetty-*.jar - ./WEB-INF/lib/jtidy-r938.jar - ./WEB-INF/lib/maven-*.jar Am I wrong? Thanks you for your answers.