Note
Access to this page requires authorization. You can try signing in or changing directories.
Access to this page requires authorization. You can try changing directories.
Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
The customizations element of the vstov4 namespace contains all the information about installing and loading each Office solution.
Syntax for document-level customizations
<customizations>
  <customization
    id
    <document
      solutionId
    />
  </customization>
</customizations>
Syntax for VSTO Add-ins
<customizations>
  <customization
    id
    <appAddin
      application
      loadBehavior
      keyName>
    <friendlyName></friendlyName>
    <description></description>
    <formRegions></formRegions>
  </customization>
</customizations>
Elements and attributes
The customizations element contains specific information about each Office solution. This element must be in the following namespace: vstov4=urn:schemas-microsoft-com:vsto.v4. Child elements of the assembly must also be in this namespace.
The customizations element has no attributes.
The customizations element has the following child element.
Customization
Required. The customization element in the vstov4 namespace is defined in <customization> element (Office development in Visual Studio).
Example of a document-level customization
Description
The following code example illustrates the customizations element for a document-level customization.
Note
This code example is part of a larger example provided in Application manifests for Office solutions.
Code
<vstov4:customizations
  xmlns:vstov4="urn:schemas-microsoft-com:vsto.v4">
  <vstov4:customization>
    <vstov4:document
      solutionId="73e" />
  </vstov4:customization>
</vstov4:customizations>
Example of a VSTO Add-in
Description
The following code example illustrates the customizations element for a VSTO Add-in. This is an Outlook VSTO Add-in that includes form regions. This code example is part of a larger example provided in Application manifests for Office solutions.
Code
<vstov4:customizations
  xmlns:vstov4="urn:schemas-microsoft-com:vsto.v4">
  <vstov4:customization>
    <vstov4:appAddIn
      application="Outlook"
      loadBehavior="3"
      keyName="ContosoOutlookAddIn">
      <vstov4:friendlyName>
        ContosoOutlookAddIn
      </vstov4:friendlyName>
      <vstov4:description>
        ContosoOutlookAddIn - Outlook VSTO Add-in
        created with Visual Studio Tools for Office
      </vstov4:description>
      <vstov4:formRegions>
        <vstov4:formRegion
            name="OutlookAddIn1.FormRegion1">
          <vstov4:messageClass name="IPM.Note" />
          <vstov4:messageClass name="IPM.Contact" />
          <vstov4:messageClass name="IPM.Appointment" />
        </vstov4:formRegion>
      </vstov4:formRegions>
    </vstov4:appAddIn>
  </vstov4:customization>
</vstov4:customizations>