View source for O365 Setup

Set up a Windows Server 2012 or Windows Server 2008 R2 server.

#Add the .NET Framework 3.51 [https://support.microsoft.com/en-us/kb/2461873] feature to the server
#Add the IIS role to the server.
#Install the Azure AD module [https://technet.microsoft.com/en-us/library/jj151815.aspx#bkmk_installmodule]
##Microsoft Online Services Sign-In Assistant for IT Professionals RTW [http://go.microsoft.com/fwlink/?LinkID=286152]
##Azure Active Directory Module for Windows PowerShell (64-bit version) [http://go.microsoft.com/fwlink/p/?linkid=236297]
#Install database if needed.
#*MySQL 5.5 Community edition [http://dev.mysql.com/downloads/mysql/5.5.html#downloads]
#Install Retain [Retain_Exchange#Exchange_Module_Office365_Basics]

see also Setting up Retain with Office 365 [http://support.gwava.com/kb/?View=entry&EntryID=2437]