By Shared Calendars do you mean the calendars under the other calendars node in Outlook ?
If so these Items are NavLinks that are stored in the Common Views folder in a Mailbox which is under the NonIPMSubtree (root) see http://msdn.microsoft.com/en-us/library/ee157359(v=exchg.80).aspx. You can use EWS to get the NavLinks from a Mailbox and use the PidTagWlinkAddressBookEID extended property to get the X500 address of the Mailbox these Links refer to and then use Resolve Name to resolve that to a SMTP Address. Then all you need to do is Bind to that folder eg
static Dictionary<string, Folder> GetSharedCalendarFolders(ExchangeService service, String mbMailboxname)
{
Dictionary<String, Folder> rtList = new System.Collections.Generic.Dictionary<string, Folder>();
FolderId rfRootFolderid = new FolderId(WellKnownFolderName.Root, mbMailboxname);
FolderView fvFolderView = new FolderView(1000);
SearchFilter sfSearchFilter = new SearchFilter.IsEqualTo(FolderSchema.DisplayName, "Common Views");
FindFoldersResults ffoldres = service.FindFolders(rfRootFolderid, sfSearchFilter, fvFolderView);
if (ffoldres.Folders.Count == 1)
{
PropertySet psPropset = new PropertySet(BasePropertySet.FirstClassProperties);
ExtendedPropertyDefinition PidTagWlinkAddressBookEID = new ExtendedPropertyDefinition(0x6854, MapiPropertyType.Binary);
ExtendedPropertyDefinition PidTagWlinkGroupName = new ExtendedPropertyDefinition(0x6851, MapiPropertyType.String);
psPropset.Add(PidTagWlinkAddressBookEID);
ItemView iv = new ItemView(1000);
iv.PropertySet = psPropset;
iv.Traversal = ItemTraversal.Associated;
SearchFilter cntSearch = new SearchFilter.IsEqualTo(PidTagWlinkGroupName, "Other Calendars");
// Can also find this using PidTagWlinkType = wblSharedFolder
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