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You can try this and see if it works (it very well may not). Click Tools -> Options and then click the "Calendar Options" button on the Preferences tab and then click "Free/Busy Options". There it gives you the choice on how many months to display on the server (the default is 2). Change that to 5 or 6 or whatever.
That may work and it may not, but that the best I can come up with. Good luck.