Are you talking about Windows clustering or SQL replication? We have a windows cluster with a virtual SQL server, and failovers are seamless to BES. (As long as your BES on a separate box that stays up, as x14 says BES itself is not clusterable. yet.)
You cannot set up native SQL db replication, however, RIM does not support it. (At one time they did and then they took it away)
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BESX 4.1.7 on Exchange 2003: 65 Devices
BESX 5.0.3 on Exchange 2003: 2007 Devices
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