As an application architect, Visio is just one other tool in my toolbox to express application designs and architectures. After re-installing Visio I noticed that some shapes I was using before were gone. I knew that I downloaded them from somewhere but no idea where I got them.
Visio shapes are stored in what is called Microsoft Office Visio stencils. (If you search on Visio stencils, you’ll find a lot of free shapes). The one I was interested in was part of the Microsoft Exchange stencil, available for free here.
After downloading, execute the file. A folder is created with 2 files(MicrosoftExchangeServer2007_Icons.vst and MicrosoftExchangeServer2007_Icons.vss). Copy these 2 files in your local My Documents\My Shapes folder.
In Visio, click File, click Open, and then go to your My Shapes folder. Open the MicrosoftExchangeServer2007_Icons.vst file. The shapes will appear in the Microsoft Exchange Server 2007 stencil in the Shapes pane.