How much RAM for small Exchange 2010 installation

I'm doing my first Exchange 2010 installation on a new Dell T610 server. The server will be an additional server in a 2003 domain, but will be running Server 2008 64-bit (obviously). There are only 20 Exchange users, but that one server will be handling all the Exchange functionality. How much RAM do I need as a minimum? Thanks.
seworbyAsked:
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Mike ThomasConsultantCommented:
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Mino DCCommented:
Whereas only 20 users, unless they have a lot of mail, I would say that 4GB of RAM are sufficient.

To obtain a more specific look at:
http://technet.microsoft.com/en-us/library/dd346700.aspx
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seworbyAuthor Commented:
Yes, I read that before asking. I suppose it's doing "multiple roles" according to this article, but do I really need 10Gb? Sounds totally OTT for 20 users... Thanks.
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Hilal1924Commented:
Exchange 2010 is exclusively 64bit and RAM is not really that expensive now. I would say for an organization of Upto 100 users with heavy usage 4-8 GB should be great.
Sometimes it is not just the number of Users who will be using email, but sometimes it could be mail spikes, Mailstorms or maybe a Spam attach which can consume resources rather quickly. So I suggest 4-8 GB :)
Hilal
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simonlimbCommented:
Hi 4GB is recommended.

more info found here:

http://technet.microsoft.com/en-us/library/dd346700.aspx 
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seworbyAuthor Commented:
Thanks for the comments. I suppose perhaps what I should have asked is: "Will Exchange actually install with these multiple roles onto server with 4Gb RAM, or do I really need 10Gb per the article to permit the installation itself to run?". I don't want to have to turn round to the customer and say "I'm sorry, but I just can't install it". They've being very mean on costs. If it were mine, I'd proably throw 16Gb at it to be sure, but it's not... Thanks.
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Hilal1924Commented:
IT will definitely support all roles with 4 GB memory.
 
Hilal
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Mike ThomasConsultantCommented:
My lab runs it with 4gig only just fine, but your is production and a new server so max out IMO as per the article. your OS has to run aswell remember.
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Mino DCCommented:
As mentioned in my reply, I advise you 4GB.

I have installed several Exchange 2010 with 4GB of RAM, with between 50 and 150 users, and nobody had any problems.

So I will say that 4GB is enough.
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seworbyAuthor Commented:
Thanks for all the help and comments which I have taken on board.
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Alan HardistyCo-OwnerCommented:
Exchange eats RAM, so don't be surprised to see most of your RAM being used up by store.exe.
I have 24Gb in my 2010 server and 17Gb is regularly in use by store.exe.
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