The difference is ownership and control. The company owns its exchange server. It allows employees access under controlled conditions, for the employer&#x27;s purposes. It&#x27;s like leaving stuff in your garage that your lawn guy might have access to. But the company doesn&#x27;t own Google&#x27;s server. It has little control over how Google accesses that data. And Google accesses that data for its own purposes. That&#x27;s more like leaving your stuff in someone else&#x27;s garage.<p>Now, Google has a 4th amendment right with respect to &quot;your&quot; mail sitting on its servers, even though its employees have access to it. Because it&#x27;s really &quot;Google&#x27;s mail,&quot; stored on Google&#x27;s property, under Google&#x27;s control.