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Upgrading Exchange and ISA

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Upgrading Exchange and ISA - 23.Mar.2012 9:59:25 AM

bullfoot

Posts: 1
Joined: 23.Mar.2012
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We are upgrading from Exchange 2007 to 2010 and from ISA 2006 to Threat Management Gateway.
My question is which should we upgrade first?
We currently have 2 mailbox servers and a client access server running Exchange 2007 with a ISA server in the DMZ authenticating with a RADIUS server. We are using a UNIX box as our edge transport. Our current plan is to install Exchange 2010 on new servers and migrate from the old to the new and replace the ISA with the TMG and install Edge Transport on the TMG server replacing the UNIX box.
Any advice on best upgrade path is appreciated.

Thanks
Rob