ContactItem.StoreEntryId supported in Office 365?

Question

I use Exchange Webservices Managed API to connect with Office365.
Per
Contact I retrieve the contact.ItemId.UniqueId and contact.StoreEntryId. However contact.StoreEntryId = null?
Is this supported in Office365?
My goal is to pop-up/display the contact card in Outlook2013. I try to achieve this via COM/OLE OOM (Outlook Object Model) by calling the GetItemFromId(EntryId, StoreEntryId) function to find the contactitem and then call the ContactItem.Display()
method. Thus, the GetItemFromId() function also requires the StoreEntryId.
Perhaps any of you has experience with Office 365 using outlook2013 (Outlook object model) and can tell me if this is the right approach?
- Is the Item.Id.UniqueId an unique Contact identifier in Office365, which I can refer to when synchronized with Outlook2013?
- Is EWS Contact.Id.UniqueId
the same as OOM EntryId (MAPI)?
- Is there an other or better way to achieve my goal?
Thank you!

Answer 1

If you want to access the contact.StoreEntryId you have to specifically request it this, else it won't be returned by default eg
ItemView ivItemView = new ItemView(1);
PropertySet itemPropset = new PropertySet(BasePropertySet.FirstClassProperties);
ExtendedPropertyDefinition PR_EntryId = new ExtendedPropertyDefinition(0x0FFF, MapiPropertyType.Binary);
itemPropset.Add(ContactSchema.StoreEntryId);
itemPropset.Add(PR_EntryId);
ivItemView.PropertySet = itemPropset;
However unlike 2010 this StoreId isn't returned in a format that you can use in MAPI see
http://social.msdn.microsoft.com/Forums/exchange/en-US/ed04d0aa-f9ed-4a3a-b9b1-85884c8c9655/ews-extendedproperty-prstoreentryid-0x0ffb-is-different-than-mfcmapioutlookspy
>>- Is EWS Contact.Id.UniqueId
the same as OOM EntryId (MAPI)?
No its not the UniqueId is the EWS identifier which is separate from the MAPI EntryId, if you want the Hex EntryId you can use the ConvertId operation
http://msdn.microsoft.com/en-us/library/office/bb799665(v=exchg.150).aspx to convert the EWSId to a hexEntryId. Or you can just request the PidTagEntryId ExtendedProperty which is easier. For the StoreId I would suggest you just construct
it from AutoDiscover eg the following should yield a valid EntryId's to use in the OOM.
ItemView ivItemView = new ItemView(1);
PropertySet itemPropset = new PropertySet(BasePropertySet.FirstClassProperties);
ExtendedPropertyDefinition PR_EntryId = new ExtendedPropertyDefinition(0x0FFF, MapiPropertyType.Binary);
itemPropset.Add(ContactSchema.StoreEntryId);
itemPropset.Add(PR_EntryId);
ivItemView.PropertySet = itemPropset;
FindItemsResults<Item> fiResults = service.FindItems(WellKnownFolderName.Contacts, ivItemView);
if (fiResults.Items.Count == 1)
if (fiResults.Items[0] is Contact) {
Contact cntContact = (Contact)fiResults.Items[0];
Byte[] EntryVal = null;
String HexEntryId = "";
String StoredHexEntryid = GetStoreId("[email protected]", service);
if(cntContact.TryGetProperty(PR_EntryId,out EntryVal)){
HexEntryId = BitConverter.ToString(EntryVal).Replace("-","");
static String GetStoreId(String emEmailAddress, ExchangeService service)
String rtReturnString = "";
AutodiscoverService adAutoDiscoverService1 = new AutodiscoverService(ExchangeVersion.Exchange2013);
adAutoDiscoverService1.Credentials = service.Credentials;
adAutoDiscoverService1.EnableScpLookup = false;
adAutoDiscoverService1.RedirectionUrlValidationCallback = adAutoDiscoCallBack;
adAutoDiscoverService1.PreAuthenticate = true;
adAutoDiscoverService1.KeepAlive = false;
GetUserSettingsResponse adResponse = adAutoDiscoverService1.GetUserSettings(emEmailAddress, (new UserSettingName[2] { UserSettingName.UserDN, UserSettingName.InternalRpcClientServer }));
if (adResponse.Settings.Count >= 2)
String UserDN = (String)adResponse.Settings[UserSettingName.UserDN];
String ServerName = (String)adResponse.Settings[UserSettingName.InternalRpcClientServer];
String flags = "00000000";
String ProviderUID = "38A1BB1005E5101AA1BB08002B2A56C2";
String versionFlag = "0000";
String DLLFileName = "454D534D44422E444C4C00000000";
String WrappedFlags = "00000000";
String WrappedProviderUID = "1B55FA20AA6611CD9BC800AA002FC45A";
String WrappedType = "0C000000";
String StoredIdStringHex = flags + ProviderUID + versionFlag + DLLFileName + WrappedFlags + WrappedProviderUID + WrappedType + StringToHex(ServerName) + "00" + StringToHex(UserDN) + "00";
rtReturnString = StoredIdStringHex;
return rtReturnString;
static string StringToHex(string asciiString)
string hex = "";
foreach (char c in asciiString)
int tmp = c;
hex += String.Format("{0:x2}", (uint)System.Convert.ToUInt32(tmp.ToString()));
return hex;