updateItem

--> POST https://exchange.dataart.com/EWS/Exchange.asmx http/1.1
Content-Type: text/xml;charset=utf-8
Content-Length: 6024
SOAPAction: http://schemas.microsoft.com/exchange/services/2006/messages/UpdateItem
<updateItemRequestEnvelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
   <s:Header>
      <t:RequestServerVersion Version="Exchange2010_SP1"/>
      <t:TimeZoneDefinition Id="Pacific Standard Time"/>
   </s:Header>
   <s:Body>
      <m:UpdateItem ConflictResolution="AlwaysOverwrite" MessageDisposition="SaveOnly" SendMeetingInvitationsOrCancellations="SendToAllAndSaveCopy">
         <m:ItemChanges>
            <t:ItemChange>
               <t:ItemId Id="000000004E6D8624FBB27843B69A1479246DF5640700DF589550AF064D469FCE63D6E3AD48D90000007E3EF100007E32B168B2004742AAE40EDD0DFCF5820002CD71DF420000" ChangeKey="DwAAABYAAABMdkyja/VqSJV6H6Cs0yfEAAByxN6o"/
               <t:Updates>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <Start>2017-02-08T15:30:00</Start>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="calendar:Start"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <Start>2017-02-08T16:00:00</Start>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="calendar:End"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <Subject>Kirill Varivoda Meeting</Subject>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="item:Subject"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                        <RequiredAttendees>
                           <t:Attendee>
                              <Mailbox>
                                 <EmailAddress>MeetingRoom4KHA5@dataart.com</EmailAddress>
                              </Mailbox>
                           </t:Attendee>
                        </RequiredAttendees>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="item:Body"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="calendar:IsAllDayEvent"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>true</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="item:ReminderIsSet"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>10</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="item:ReminderMinutesBeforeStart"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                        <Location>Meeting Room KHA 8.1</Location>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="calendar:Location"/>
                  </t:SetItemField>
                  <t:SetItemField>
                     <t:t:CalendarItem>
                        <ReminderIsSet>false</ReminderIsSet>
                        <ReminderMinutesBeforeStart>0</ReminderMinutesBeforeStart>
                        <IsAllDayEvent>false</IsAllDayEvent>
                        <LegacyFreeBusyStatus>Busy</LegacyFreeBusyStatus>
                     </t:t:CalendarItem>
                     <t:FieldURI FieldURI="calendar:Recurrence"/>
                  </t:SetItemField>
               </t:Updates>
            </t:ItemChange>
         </m:ItemChanges>
      </m:UpdateItem>
   </s:Body>
</updateItemRequestEnvelope>
--> END POST (6024-byte body)