Exchange Casarray server memory allocation

How much memory must be allocated to the casarray server for about 550 mailboxes.

Current;y have 2 X CAS servers allocated 4GB each.....is this enough?
momtoelihleAsked:
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AmitConnect With a Mentor IT ArchitectCommented:
If you have only CAS role then 4GB minimum and maximum 2GB Per Core. Ref
http://technet.microsoft.com/en-us/library/dd346700%28v=exchg.141%29.aspx
http://technet.microsoft.com/en-us/library/dd346700%28v=exchg.141%29.aspx

How many users have in total and how many are going to use

Outlook Locally on the users PC, OWA, ActiveSync...

According to me you should look for minimum 8-12GB of RAM here. As you need memory for OS, AV, Monitoring tools etc.
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Manpreet SIngh KhatraSolutions Architect, Project LeadCommented:
I assume its enough but also very much depends on whats the usage plan .... meaning do they just use Outlook or they would be much more usage ?

Did you try using the Storage calculator to understand the configuration

- Rancy
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momtoelihleAuthor Commented:
It's an environment I've just inherited.

Usage plan - Outlook Locally on the users PC, OWA, ActiveSync...
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momtoelihleAuthor Commented:
About 600 users...
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AmitIT ArchitectCommented:
Then go with 12 GB.
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momtoelihleAuthor Commented:
Thank you.
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