title: Use EWS API and SQL Server database as data sources
body: <p>I am new to EF an am trying to build (what I think) is a rather simple application for my office. I am writing an application to track the projects we bid on. Each biditem will track (through navigation properties) which clients (bidders) we are bidding to (construction industry, so multiple clients per project), and project notes. </p>
  
  <p>I am planning on using EF (with SQL Server) for the bidtracker, but I want to use the EWS Managed API to get/maintain the contact info so that the office only has to maintain one contact list which is available through Outlook. </p>
  
  <p>So, is it possible to have mixed data sources (SQL Server and Exchange server) with Entity Framework? If so, can you point me to a good resource to help me wire it?</p>
  
  <p>Here is a simplified model (the <code>BidItem</code> and <code>Note</code> will be in SQL Server, the <code>Contact</code> will be from Exchange):</p>
  
  <p><img src="https://i.stack.imgur.com/29rCE.jpg" alt="enter image description here"></p>