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how does one increase the performance on opening outlook calendars?

how does one increase the performance on opening outlook calendars on cross-site exchange servers? In our orgaziation, calendaring is probably the most resource intensive and frequently used part of the email client. The admin staff (reception, secretary, PA) will typically have the following open on their client all day – their own calendar, the partner/associate/analysts to who they are assigned and then 3-4 conference room calendars. They spend half the day booking appointments, changing appointments (time, place, details for dial-in, etc.).
They are CONSTANTLY complaining that opening calendars freezes outlook (white screen of death) – especially when opening a calendar on a remote Exchange Server (we have 2 sites linked by a dedicated 10MB pipe).
I have explained many times that the fact that people keep presentations (40-50MB) in their calendars means that the time-to-open will be horrendous.
We have even tried cached-mode for the calendars but it results in local OST files of 10-20GB which kills Outlook also.
Does anyone have any insights/solutions (… apart from the very helpful “well if we were on gmail this wouldn’t be an issue” comments …¿ ) that could help out?
We are on Exchange 2003 and the clients are a mix of Outlook 2007 & 2010.
I am considering the move to Exchange 2010 - but only if this really is going to help this issue.
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TommySzalapski
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I would impose size limits on the mailboxes to force them to be smart about it. There really isn't any other way if caching the shared and public folders doesn't work. That's just too huge.
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Thanks - in an ideal situation that would be a great recommendation. In reality, unfortunately it won't work :-(
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TommySzalapski
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Doesn't realistically work in our environment