Microsoft Exchange Server VS Tiki Wiki CMS Groupware

Tiki is very flexible full-featured multilingual content management system (CMS) which you can use “out-of-the-box” to build your own website (PWA or anything else you can imagine to access using a web browser).

It is a Free/Libre OpenSource Software (licensed under GNU/LGPL) which is being released every 8 months under the Tiki Wiki CMS Groupware project. Tiki is a "wiki-way" all-in-one application powered by PHP, MySQL, Zend Framework, jQuery, Bootstrap and Smarty. Actively developed by large international community of contributors and translated in over 40 languages Tiki can be used to create all sorts of web-based applications like blogs, news sites, portals, knowledge bases, community wikis, company intranets or extranets.

Tiki offers a very large number of features out-of-the-box. Arguably more than any other Open Source Web Application. Highly configurable & modular, all the features are optional and easily administered via any web browser.

Major features include a robust wiki engine, news articles, discussion forums, newsletters, blogs, a file/image gallery, data tracker (e.g. for bug & issues, form generator), a links directory, polls/surveys and quizzes, a FAQ, a banner management system, a calendar, geolocation with maps, RSS feeds, a category system, tags, an advanced templating system, inter-user messages, a menu generator, a powerful user, group and permission system, internal search engine, external authentication support, and much more.