The solution presented here is a Mailbox Resiliency solution utilizing 2 Database Availability Groups (DAGs) and 2 copies of every database. The tested environment simulates all users in these DAGs running on a single Storage Center of the 2 Storage Center configurations, as in a failover event. The number of users simulated was 50,000 across 10 servers, (5 servers per DAG), with 5,000 users per server. The mailbox size was 2GB per user. Each server has 5 databases, with one copy local and the second copy replicated to a second server on a second Storage Center. This provides redundancy through hardware and software.