Drupal is an open source content management platform powering millions of websites and applications
SharePoint is a Microsoft-based platform for building web applications. It covers a widerange of capabilities and while it is appropriate for experienced webdevelopers, even non-technical minded users can easily navigate through thesystem and execute functions such as collaborating data, managing documents andfiles, creating websites, managing social networking solutions, and automatingworkflow.
Major areas that SharePoint deals with are websites,communities, content, search, insights, and composites. The purpose is to give usersthe ability to create or develop these key business components on their owneven without technical knowledge of, for example, how to build a website or howto integrate coding. Configuring SharePoint into a business's system is meantto cut out all of the complicated steps, and pave the way for easierimplementation all around.
VMWare Zimbra provides open source email and calendar groupware software, Zimbra is a popular choice for Linux and Mac OS X email servers and supports SaaS.
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