Outlook not updating calendar exchange
When you click Calendar in the navigation pane, you'll see a list of My Calendars (those in your mailbox) and Other Calendars (from Windows Share Point Services—WSS—sites or other Exchange users' mailbox Calendar folders that you've viewed).The trick to adding a public folder calendar to the Other Calendars list is to switch to the folder list and drag the calendar folder to your Public Folder\Favorites area.
123 Sync supports ALL versions of Exchange and ALL version of Outlook 32-bit implementations.
If you access it through the Favorites hierarchy or the Other Calendars list, Outlook 2003 is likely to experience corruption of the custom forms cache. I've checked your problem and it works with my Outlook 2007 as described by Sue the following way: The trick to adding a public folder calendar to the Other Calendars list is to switch to the folder list and drag the calendar folder to your Public Folder\Favorites area.
Microsoft has a hotfix designed to solve this problem. The public folder calendar automatically becomes available in the Other Calendars list.
While the direct answer is “yes, it can be configured”, the reality is that it might not actually really matter anyway for most configurations. The description for the HTTP connection doesn’t really hold true anymore as the HTTP connection can also be used internally.
In fact, over the past few Exchange versions, the trend was to move away from the direct RCP connections and towards HTTP connections, even internally.