2147483647 is 0x7FFFFFFF, which is -1, which means "I have no idea how many
messages you have because of the posible recurrences in the Calendar
folder".
What OutlookSpy displays is the regular (non-Calendar) CDO folder - CDO is
not smart enough to realize that it is really a Calendar folder, you need to
force it to return its Calendar-aware version of the Folder object by
calling Session.GetDefaultFolder().
Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool