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RetrieveMultiple does not return all attributes
List<ConditionExpression> cons = new List<ConditionExpression>();

            QueryExpression query = new QueryExpression();
            query.EntityName = "systemuser";

            cons.Add(new ConditionExpression());
            cons[cons.Count - 1].AttributeName = "isdisabled";
            cons[cons.Count - 1].Operator = ConditionOperator.Equal;
            cons[cons.Count - 1].Values = new object[] { false };

            FilterExpression filter = new FilterExpression();

            // Set the properties of the filter.
            filter.FilterOperator = LogicalOperator.And;
            filter.Conditions.AddRange(cons.ToArray());

            //query.ColumnSet = new AllColumns();
            query.ColumnSet = new ColumnSet(new string[]{"systemuserid","fullname","firstname","lastname"});
            query.Criteria = filter;
            query.Orders.Add(new OrderExpression("fullname", OrderType.Ascending));

            RetrieveMultipleRequest RMR = new RetrieveMultipleRequest();
            RMR.Query = query;
            RMR.ReturnDynamicEntities = true;

            RetrieveMultipleResponse resp = (RetrieveMultipleResponse)CRM.Execute(RMR);