Exchange Server 2010 Role
|
Minimum RAM
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Recommended maximum RAM
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Mailbox
|
4 GB
|
4 GB + 3-30 MB for each additional mailbox
|
Client Access
|
4 GB
|
2 GB per core (8 GB minimum)
|
Hub Transport
|
4 GB
|
1 GB per core (4 GB minimum)
|
Edge Transport
|
4 GB
|
1 GB per core (4 GB minimum)
|
Unified Messaging
|
4 GB
|
2 GB per core (4 GB minimum)
|
CAS/HT role on the same physical server
|
4 GB
|
2 GB per core (8 GB minimum)
|
CAS/HT/Mailbox role on the same physical server
|
8 GB
|
4 GB + 3-30 MB for each additional mailbox
|
Reference from Microsoft link
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