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How to migrate Brightmail 6.1.1 Exch2003 to 6.4 Exch2010 ??

Created: 16 Nov 2012

I have a working exchange 2003 box running brightmail 6.1.1 and I am in the process of upgrading to exchange 2010 on a new server running server 2008r2. How can I go about migrating all the data over to the new server and into brightmail 6.4??

I can't find any documentation about how to do this.