AD Web browser Outlook (remote user) Mobile phone Line of business application Outlook (local user) External SMTP servers Exchange Online Protection Enterprise Network Phone system (PBX or VOIP) Edge Transport Routing and AV/AS Layer 4LB CAS Array DAG CAS MBX

Benefits“Considerations” Simplified deployment & connectivity model Increased resource usage (see managed availability, content indexing in particular) Cache efficiencies Everything interacts (and workload management mediates) Hardware efficiencies (balanced resource utilization) Unified Messaging on all Mailbox servers

Benefits“Considerations” Stateless Net-new role in 2013, adds performance “cost” – can potentially mitigate by shifting some resources from LB to CAS Load balancing optimizations Low CPU & memory footprint Connection scalability

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Mailbox or multi-role (Mailbox+CAS)8GB minimum RAM CAS4GB minimum RAM

Messages sent or received per mailbox per day Mcycles per User, Active DB Copy or Standalone (MBX only) Mcycles per User, Active DB Copy or Standalone (Multi- Role) Mcycles per User, Passive DB Copy

Messages sent or received per mailbox per day Mailbox role memory per active mailbox (MB)

Per-server DB copies Minimum physical memory (GB)

Dedicated Role Deployment Example CustomerRTM GuidanceSP1 Guidance Customer 123 CAS / Site33 CAS / Site Multi-Role Deployment Examples CustomerRTM GuidanceSP1 Guidance Customer 294% CPU at peak102% CPU at peak Customer 382%88% Customer 474%80% Customer 544%47% Customer 642%45%