Did you just lose access? Are the shares missing data or just permissions? Is it all shared calendars including domain and user level, or is it limited to just domain level shares? Were those shares visible again after reattaching to them? The tickets you've referenced are older tickets that both reference the first ticket number you noted and only affected Outlook clients with multiple MAPI accounts set up - is that still the case?
Kyle Kerst
Acting IT Manager
SmarterTools Inc.
www.smartertools.com