Desktop Sync Software Error: "The Operation terminated unexpectedly" During Outlook Calendar Sync

Question

My system is a standalone Dell PC running WinXP Pro SP3, Outlook 2003 SP3, and BB Desktop Software 6.1.0.36 (latest update).  Device is a Bold 9900.  Problem is with Blackberry Desktop synchronization of my Outlook Calendar; all other Organizer functions sync fine to Outlook 2003 if the Calendar is left un-sync'ed.  When Calendar sync is checked to Outlook, either alone or with the rest of the Organizer functions, sync seems to progress to a point and "sees" device (Bold 9900) and Outlook Calendars, sees all the calendar events (2518 at present in the Bold, 2444 in Outlook) and sees additions/deletions and changes.  It even gets as far as requesting verification of the changes required to sync.  When process to update proceeds, the device calendar is polled once more, then the error message "The Operation terminated unexpectedly" appears, process stops, and Desktop Software becomes "hung". Sometimes Outlook also hangs.  This occurs in both a "two-way sync" and a "one-way sync" (device over-writes Outlook).
Solutions on BB Support pages have been tried (deleted and replaced mapi32.dll file etc.) but most solutions offered appear to relate to later Outlook versions (2007 & 2010) and don't relate to Outlook 2003.  I have also deleted the IntelliSync folder in the Research in Motion folder and re-initiated sync configuration to no avail.  I especially like BB's coment on their Support page KB15735 (although it doesn;t mention Outlook 2003, nor Desktop Software 6.0): 
This is a previously reported issue that has been escalated internally to our development team. No resolution time frame is currently available.
I previously used IntelliSync for a Palm 515 (and older Palm PDA's) on this PC with no problems.  Older versions of IntelliSync and Palm software were all removed before BB Desktop Software installation.  Also had tried un-installing Blackberry Desktop program and re-installing latest version.
The same Bold 9900 works fine syncing with my Win7 Pro 64 bit laptop running Outlook 2007 for all sync functions.  Am I destined to upgrade my old desktop to Outlook 2007 or is there another fix?
TIA,
Keith

Answer 1

In my desparation to keeping trying different avenues, I tried uninstalling the DM again but reinstalled version 4.3.0.15 (Aug 15 '07) instead of the more recent versions (had previously tried both 4.5 and 4.6 with the same errors messages received). 
My first attempt to synch my Outlook Calendar with v.4.3 didn't work either but for some reason, it does work now.  Go figure?  I'm just going to cross my fingers & hope this older version will continue to work.