Effective SPAM filter for stand alone exchange 2007?

I have just deployed an exchange 2007 server and the company gets a ton of spam..  The client would like me to recommend a product to minimize this without bouncing stuff they need.  Does anyone have the answer?
tarkmylerAsked:
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rogerhuntCommented:
http://www.postini.com/
Postini Junk E-mail & Spam Filtering  Cost is 1.00 per month per email address.  The exchange box is setup to only allow mail from the Postini servers & all mail routes through Postini.  This is a spam/virus filter that is adjustable at the domain level & user level.  Each user is able to login individually to manage settings & check the emails that are being blocked (if needed).  Postini authenticates the user account by popping the Exchange server using the password that is entered during login.
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coraxalCommented:
We use Barracuda spam filters (model 400) and it has reduced spam significantly. It also blocks viruses. I've read some good things about Ironport even though I havent used it myself.
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kieran_bCommented:
Vamsoft ORF has just released a version for 2007, $200 for the server irrespective of users, and does a fantastic job.  Key to this is Greylisting, which has done an amazing job getting rid of spam on my networks.

http://www.vamsoft.com
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LeeDerbyshireCommented:
Did you know that you can add a built-in antispam agent without adding an Edge server:
http://technet.microsoft.com/en-us/library/bb201691(EXCHG.80).aspx
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