XFOR: Dirsync Role/Number of Servers can Change DXA Addresses

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When you install the first MSMail Connector component in a site, the DXA is assigned the MSMail alias $SYSTEM. For example:

   First server:  <organization>/<site>/$SYSTEM
				

When you add additional MSMail Connectors to the site, $SYSTEM is replaced by SYSTEMx, where x starts with 1 and is incremented by 1 with each additional MSMail connector installed. For example:

   Second Server: <organization>/<site>/SYSTEM1
   Third Server:  <organization>/<site>/SYSTEM2
				

However, if Microsoft Exchange Server is a directory synchronization requestor, the SYSTEMx address will be used, even if this is the first Microsoft Exchange Server in the site. This is because we don't know if there will be another Microsoft Exchange Server in the site that will act as a directory synchronization server, in which case the address must be $SYSTEM.

If a Microsoft Exchange Server that acts as a directory synchronization server is later changed to be a directory synchronization requestor, the DXA address will be modified to SYSTEM1. If a SYSTEM1 address already exists in the same site, SYSTEM2 will be used and so forth.