Which version of Exchange 2010 should I get

I have a client who is running SBS 2003 and wants to migrate to Server 2008 R2 and Exchange 2010. Which version of Exchange 2010 should he get. Enterprise or standard? 20 users OWA and mobile support needed.
Thanks
Bert McFerrinIT ManagerAsked:
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AmitIT ArchitectCommented:
Standard is enough.
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Bert McFerrinIT ManagerAuthor Commented:
If I get Standard do I have to purchase CAL's or does it support the 20 or so users I need.
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Bert McFerrinIT ManagerAuthor Commented:
Thanks for quick response.
Bert McFerrin
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