Exchange 2010 design requirements

We need to build a new Exchange 2010 design but are not sure how many server's we need and what roles they should perform.

Currently we have 280 Mailboxes and currently 160 Gig of data in the information store.

Can anyone advise on what we require.
NSSUKAsked:
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Justin DurrantConnect With a Mentor Sr. Engineer - Windows Server/VirtualizationCommented:
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endital1097Connect With a Mentor Commented:
the number of servers you need depends on your goals and requirements
if you want high availability you need a minimum of 4 servers (2 MBX and 2 CAS/HUB)
if you want exchange to handle your anti-spam you'd want an EDGE server

a single mbx server with the correct disk configuration could easily handle your user count
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MrN1c3Connect With a Mentor Commented:
You best bet is to run through a design tool

Dell and HP both have good ones;

http://g3w1656g-vip.houston.hp.com/sb/installs/Exchange2010_Sizer.zip
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MrN1c3Commented:
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