How to assign Tasks to other users using Exchange Web Service.
Any workaround also would help

• Edited by Aparna_SQL Tuesday, April 30, 2013 5:02 AM
• Moved by Bob ShenMicrosoft contingent staff Wednesday, May 01, 2013 6:49 AM

Hi Aparna_SQL,

I am moving your question to Exchange Server forum for better responses. 

Assigning tasks like you can do in Outlook is not supported in any version of EWS on Exchange and its not a feature that has ever been supported in OWA. The only workaround is to use MAPI via the OOM or Redemption. One thing you can do in EWS if you have rights to the user you want to delegate the task to is just create a Task in their mailbox directly.

Cheers
Glen

• Proposed as answer by Jason Johnston [MSFT]Microsoft employee, Moderator Thursday, February 05, 2015 9:15 PM

Hi Glen,

Is it possible to assign task items using EWS by setting the MAPI Property on ExtendedPropertyType instance and adding that to an UpdateItemType.

Thanks a lot.

Jas

There is no support for doing this in EWS (still) theoretically if you can set the right the extended property combination that should work but you still need to send the assignment emails to the assignee and there is also nothing to do that or process the responses etc.

Cheers
Glen

Hi Glen,

I am trying to use ExtendedPropertyType and put in UpdaterItemType as in this code as below. Although it is not updating the Owner field.

I have tried it both by Propertyname and PropertyID. Although new custom property's canbe added but to change an existing one like 'Owner' ? Would this be the right method.

2. And Is ProprertyID a fixed value as 0x811f or does it need to be calculated.

3. Is 'Owner' the right propertname for assigning a task ?

Thanks a lot.

Please see code below for reference.

 PathToExtendedFieldType pathExtended = new PathToExtendedFieldType();
            //pathExtended.DistinguishedPropertySetId = DistinguishedPropertySetType.PublicStrings;
            pathExtended.DistinguishedPropertySetId = DistinguishedPropertySetType.Task;
            pathExtended.DistinguishedPropertySetIdSpecified = true;
            pathExtended.PropertyId = 0x811f;
            pathExtended.PropertyIdSpecified = true;
            //pathExtended.PropertyName = "Owner";
            pathExtended.PropertyType = MapiPropertyTypeType.String;


            ciSetAT.ExtendedProperty = new ExtendedPropertyType[1];
            ciSetAT.ExtendedProperty[0] = new ExtendedPropertyType();
            ciSetAT.ExtendedProperty[0].ExtendedFieldURI = pathExtended;
            ciSetAT.ExtendedProperty[0].Item = "chen@abc.com";

            SetItemFieldType set1 = new SetItemFieldType();
            set1.Item = pathExtended;
            set1.Item1 = ciSetAT;

            UpdateItemType request = new UpdateItemType();
            request.ItemChanges = new ItemChangeType[1] { new ItemChangeType() };
            request.ItemChanges[0].Item = itemId;
            request.ItemChanges[0].Updates = new ItemChangeDescriptionType[2];
            request.ItemChanges[0].Updates[0] = setstart;
            request.ItemChanges[0].Updates[1] = set1;

• Edited by Jaspreet Toronto 19 hours 10 minutes ago