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Running SQL 2008 and 2005 on the same 2 node cluster

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Last Modified: 2011-09-20
We currently have a 2 node cluster with 2 instances of SQL 2005 that normally run in an active active config. One of our developers wants to upgrade one of the instances to 2008 while the other instance will have to stay as 2005 as the application that runs is not compatible.

Is this a supported and recommended configuration?

Any thing we should do to make the upgrade process run smoothly?
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This one is on us!
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