As you migrate to SiteMinder 6.x, your site can contain a combination of SiteMinder components at different versions. In addition, you do not have to upgrade all your sites to 6.x but leave some at SiteMinder 5.x.
If your environment has a mix of 5.x and 6.x components, 6.x Policy Servers can use 5.x or 6.x policy stores, as illustrated in the following figure. Regardless of whether you have a mix of Policy Server versions, users can access resources and have the same experience using 5.x or 6.x Agents. Also, a mixed environment supports single sign–on.
5.x and 6.x Policy Servers can communicate with a 5.x policy store and key store, as shown in the following figure. Further, you can manage objects in the 5.x policy store using either the 5.x or 6.x Policy Server User Interface.

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