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That is a specific issue regarding conflicts with the Blackberry RIM application. You can disregard it unless you are the kind of masochist who likes to stack completely unrelated applications on the same box. For all the core Orion stuff I strongly recommend installing them to the same server, except in places where the documentation specifically indicates it should be stand alone such as DPA, Mobile Admin, the NTA database, or Patch Manager.
There is no documentation specifically on polling servers, officially SW will tell you that pollers have the same hardware requirements as the core application server they tie back to. In practice you tend to see pollers using significantly less memory or CPU but exactly how much less depends on how close you are to maxing out the capacity of the poller. A fully stacked instance of the poller (You can stack up to 3 poller instances on the same server) running 100% utilization would likely use more memory than a normal primary server.
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