That's a pretty vague question... it will depend on the number of users (exch and BB); what sort of usage they have (emails, web, other applications, etc); what other applications (server or BB or MDS); server specs
In general, I find the BES pretty efficient by default, and you might only need to worry if you have a large number of users.
Exchange optimization is another matter
Regards,
Mike Lazarus
ACT! Evangelist
GL Computing, Aust
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