I recommend moving them to SharePoint. Is there any reason why they
need to stay in Exchange? It's very easy to move all of the
appointments in the entire calendar over to a new SharePoint calendar.

Is there an easy way to export PF calendars  to Sharepoint calendars?

I believe, but not certain that codeplex as a tool. If not try to download to
excel and the do and import back to SP.

No export function that I can see natively. I may have to do it manually but our
MOSS deployment is in the early stages.

Yes, very easy.

1. Create the new calendar in SharePoint, and connect it to your
Outlook
2. In outlook, navigate to the public  folder. Change the outlook
current view to "By Category".
3. Ctrl + A to select all.
4. Make sure you're using Outlook 2007, and copy and paste, or drag
all of these contents into the new SharePoint Calendar that you
connected to your Outlook