Is a second license required for a "hot standby" server?

We currently have one Exchange Server 2003 (Enterprise Edition, with Service Pack 2) setup and running on our network. A couple of months ago our old exchange server crashed hard and we had to build a completely new one and restore mailboxes from backup tapes. What we want to do now, in case something like this happens again, is to have a hot standby ready to go. We will be using Double-Take to replicate everything to the second server. My question is, do we need to purchase a second license for this other server? Or can we use the same license since its not technically "in production", and only becomes so when, and if, the first one goes down.
ITGonlineAsked:
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tigermattConnect With a Mentor Commented:
If the second server has Exchange installed to it whilst the first server also technically still has Exchange installed, then you need a second license. It doesn't matter if it's not in production, you still need a license.

-tigermatt
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tigermattCommented:
So just to clarify only if you uninstalled Exchange from one server before installing it to the other could you possibly just use 1 license - anything other than that will require two licenses.
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ITGonlineAuthor Commented:
Thanks Matt!

I would like to try and upgrade to Exchange Server 2007, to utilize LCR at the very least, and knowing that we will have to purchase a separate license for the secondary 2003 server may just be the persuader I needed.
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tigermattCommented:
Thanks, ITGonline!
--tigermatt
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