Recommendations are based on benchmark sizing data and are estimates of user load per server based on Exchange MAPI benchmark results.
Benchmarks have real-world applicability limitations.
Other issues such as storage and disaster recovery requirements are not addressed in benchmarking activities. You should conduct careful planning and pilot exercises to determine server capacities in your Exchange Server deployment. System memory recommendations are based on estimates of 100 to 150 KB per user as seen in benchmarking activities and production deployments. For more information, contact us today.