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I would look at a hosted option for Outlook.
Given the cost to replace the hardware/expand it hosting it makes more sense.
We hosted out our parish exchange at rackspace, about the same size
for less money per year that the hosted site than the 3 year amortization cost of a new server
We don't have have the archive retention requirements you may have, however that can be addressed with the vendor.
If you still wish to have it locally hosted, TDF's hosted archive solution is the way to go.
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