Add SSSAdminProd user and sync operations documentation

This article provides an overview of the changes customers can expect and observe when server-side sync transitions to a new identity when communicating with Dataverse.

Author: foviedoITBA

support/power-platform/dataverse/email-exchange-synchronization/sssadminprod.md

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+---
+title: SSSAdminProd user and server-side sync operations
+description: Provides guidance around the impact of the new identity used by server-side sync in Dynamics
+---
+
+# SSSAdminProd user and server-side sync operations
+
+This article provides an overview of the changes customers can expect and observe when server-side sync transitions to a new identity when communicating with Dataverse.
+
+## Symptoms
+
+> - A new system user named SSSAdminProd is present in Dynamics 365
+> - Some operations performed by server-side sync show up as being performed by SSSAdminProd instead of SYSTEM in the audit logs
+> - Some records created or updated by server-side sync have the SSSAdminProd system user in the delegate auditing fields, such as "Created By (delegate)" and "Modified By (delegate)"