Exchange 2007 server & Microsoft Outlook 2003 - CALENDAR - availability look

Question

Question:

I would like to know where in Exchange Server 2007 enterprise edition can i change the Calendar availability look.

Example:
I want to reserve a meeting with someone in my company, by using calendar in outlook 2003 to see his availiabilty. The problem is, that I can see he's availability only till november, but I would like to arrange a meeting in December. I guess there is one setting on Exchange server, which allows to see availability of someone, only for 2 next months, but not further then that.

Plz help.

With best regards

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bostjan - halcom d.d.