manifest.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<OfficeApp
  xmlns="http://schemas.microsoft.com/office/appforoffice/1.1"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0"
  xmlns:mailappor="http://schemas.microsoft.com/office/mailappversionoverrides"
  xsi:type="MailApp">

  <Id>20ecd0b2-4157-492b-8d0b-475b729f48eb</Id>
  <Version>1.0.0.0</Version>
  <ProviderName>ClearCode</ProviderName>
  <DefaultLocale>en-US</DefaultLocale>
  <DisplayName DefaultValue="FlexConfirmMail"/>
  <Description DefaultValue="A template to get started."/>
  <IconUrl DefaultValue="https://127.0.0.1:10041/assets/icon-64.png"/>
  <HighResolutionIconUrl DefaultValue="https://127.0.0.1:10041/assets/icon-128.png"/>
  <SupportUrl DefaultValue="https://github.com/FlexConfirmMail/Outlook-Office-Addin"/>
  <Requirements>
    <Sets DefaultMinVersion="1.1">
      <Set Name="Mailbox" />
    </Sets>
  </Requirements>
  <FormSettings>
    <Form xsi:type="ItemEdit">
      <DesktopSettings>
        <SourceLocation DefaultValue="https://127.0.0.1:10041/app.html" />
      </DesktopSettings>
    </Form>
  </FormSettings>
  <Permissions>ReadWriteMailbox</Permissions>
  <Rule xsi:type="RuleCollection" Mode="Or">
    <Rule xsi:type="ItemIs" ItemType="Message" FormType="Edit" />
    <Rule xsi:type="ItemIs" ItemType="Appointment" FormType="Edit" />
  </Rule>

  <VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides" xsi:type="VersionOverridesV1_0">
    <!-- On Send requires VersionOverridesV1_1 -->
    <VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides/1.1" xsi:type="VersionOverridesV1_1">
      <Description resid="residAppDescription" />
      <Requirements>
        <bt:Sets DefaultMinVersion="1.12">
          <bt:Set Name="Mailbox" />
        </bt:Sets>
      </Requirements>
      <Hosts>
        <Host xsi:type="MailHost">
          <Runtimes>
            <!-- HTML file that references the JavaScript event handlers. This is used by Outlook on the web and on Mac, and in new Outlook on Windows. -->
            <Runtime resid="residUILessFunctionFileUrl">
              <!-- JavaScript file that contains the event handlers. This is used by classic Outlook on Windows. -->
              <Override type="javascript" resid="residUILessFunctionJsFileUrl"/>
            </Runtime>
          </Runtimes>
          <DesktopFormFactor>
            <FunctionFile resid="residUILessFunctionFileUrl" />
            <ExtensionPoint xsi:type="Events">
              <Event Type="ItemSend" FunctionExecution="synchronous" FunctionName="onItemSend" />
            </ExtensionPoint>
            <ExtensionPoint xsi:type="LaunchEvent">
              <LaunchEvents>
                <LaunchEvent Type="OnNewMessageCompose" FunctionName="onNewMessageComposeCreated"/>
              </LaunchEvents>
              <SourceLocation resid="residUILessFunctionFileUrl"/>
            </ExtensionPoint>
          </DesktopFormFactor>
        </Host>
      </Hosts>
      <Resources>
        <bt:Urls>
           <!-- The JavaScript code is hosted on a secure and trusted web server. -->
          <bt:Url id="residUILessFunctionFileUrl" DefaultValue="https://127.0.0.1:10041/app.html" ></bt:Url>
          <bt:Url id="residUILessFunctionJsFileUrl" DefaultValue="https://127.0.0.1:10041/app.js" ></bt:Url>
        </bt:Urls>
      </Resources>
    </VersionOverrides>
  </VersionOverrides>
</OfficeApp>