Internet Explorer 10 is available by default with Windows Server 2012 /R2 , which includes Adobe Flash Player as a platform feature. However, the plugin is enabled only if you enable the Desktop Experience feature.
To enable Desktop Experience on Windows Server 2012
1. Open Server Manager and click Add Roles and Features.
2. When the Add Roles and Features Wizard appears, specify the appropriate values on the Installation Type, Server Selection, and Server Roles pages.
3. On the Features page, expand User Interfaces and Infrastructure and select Desktop Experience.
4. On the Confirmation page, select Restart the destination server automatically if required and click Install.
On Windows 2008 R2 please visit www.adobe.com to download and install the latest version of Flash Player. It is not necessary to enable Flash Player on Windows 2008 R2.