Retain Getting Started
Retain is a robust archiving and eDiscovery solution. Archiving has traditionally been focused on corporate email systems, but Retain not only archives more email systems than your typical solution (GroupWise, Exchange, Google Apps) - it also can archive Android SMS, Blackberry, Facebook, and Twitter.
For a comprehensive list of supported operating systems, database systems, email systems, etc, see Retain System Requirements.
Organizing the content of the Retain training site proved to be problematic. It could not be organized strictly by the UI as was the GWAVA topic, so a hybrid approach was adopted. On the left-hand navigation pane, some of the major topics are listed; however, under the "Server" section, you'll notice that it follows the RetainServer web interface UI in case that makes it easier for a person to follow. This means that some of the topics under "Server" are actually duplicates of what is listed for that same topic listed in the navigation pane. For example, there is a "Storage" topic listed under the Retain navigation pane; however, when in the "Server" topic, "Storage" is listed there as well. Both links point to the exact same topic.
The next topic you should study is "Installation & Upgrade".