For all who are involved in Exchange 2010 sizing you can find here a detailed guidelines about the ratio of Hub/CAS and Mailbox servers resources .
The basic guidelines are as follow , based on the number of processor’s cores :
| Server role configuration | Recommended processor core ratio |
| Mailbox : Hub Transport | 7:1 (no antivirus scanning on Hub Transport server) 5:1 (with antivirus scanning on Hub Transport server) |
| Mailbox : Client Access | 4:3 |
| Mailbox : Client Access and Hub Transport combined role | 1:1 |
In addition, for Active Directory / mailbox server ratios :
- If Active Directory is running on the x86 platform (32-bit), the recommended ratio of Active Directory directory server processor cores to Exchange 2010 Mailbox server processor cores is 1:4.
- If Active Directory is running on the x64 platform (64-bit), the recommended ratio of Active Directory directory server processor cores to Exchange 2010 Mailbox server processor cores is 1:8
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