5.4 http://schemas.microsoft.com/office/mailappversionoverrides Schema

 <xs:schema id="MailAppVersionOverrides" elementFormDefault="qualified" version="1.0" targetNamespace="http://schemas.microsoft.com/office/mailappversionoverrides" xmlns="http://schemas.microsoft.com/office/mailappversionoverrides" xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0" xmlns:mailor1_1="http://schemas.microsoft.com/office/mailappversionoverrides/1.1" xmlns:xs="http://www.w3.org/2001/XMLSchema">
   <xs:import schemaLocation="MailAppVersionOverridesV1_1.xsd" namespace="http://schemas.microsoft.com/office/mailappversionoverrides/1.1"/>
   <xs:import schemaLocation="OfficeAppBasicTypesV1_0.xsd" namespace="http://schemas.microsoft.com/office/officeappbasictypes/1.0"/>
   <xs:simpleType name="EventFunctionExecutionType">
     <xs:restriction base="xs:string">
       <xs:enumeration value="synchronous"/>
       <xs:enumeration value="asynchronous"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="Event">
     <xs:attribute name="Type" type="bt:ShortString" use="required"/>
     <xs:attribute name="FunctionExecution" type="EventFunctionExecutionType" use="required"/>
     <xs:attribute name="FunctionName" type="bt:LongString" use="required"/>
   </xs:complexType>
   <xs:complexType name="ShowTaskpane">
     <xs:complexContent>
       <xs:extension base="Action">
         <xs:sequence>
           <xs:element name="SourceLocation" type="bt:URLResourceReference" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="ExecuteFunction">
     <xs:complexContent>
       <xs:extension base="Action">
         <xs:sequence>
           <xs:element name="FunctionName" type="bt:LongString" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="Action" abstract="true"/>
   <xs:complexType name="Supertip">
     <xs:sequence>
       <xs:element name="Title" type="bt:ShortResourceReference" minOccurs="1" maxOccurs="1"/>
       <xs:element name="Description" type="bt:LongResourceReference" minOccurs="1" maxOccurs="1"/>
     </xs:sequence>
   </xs:complexType>
   <xs:complexType name="Rule" abstract="true"/>
   <xs:complexType name="ItemIs">
     <xs:complexContent>
       <xs:extension base="Rule">
         <xs:attribute name="ItemType" type="bt:NonEmptyString" use="required"/>
         <xs:attribute name="ItemClass" type="bt:NonEmptyString" use="optional"/>
         <xs:attribute name="IncludeSubClasses" type="xs:boolean" use="optional"/>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="ItemHasKnownEntity">
     <xs:complexContent>
       <xs:extension base="Rule">
         <xs:attribute name="EntityType" type="bt:ShortString" use="required"/>
         <xs:attribute name="RegExFilter" type="bt:NonEmptyString" use="optional"/>
         <xs:attribute name="FilterName" type="bt:NonEmptyString" use="optional"/>
         <xs:attribute name="IgnoreCase" type="xs:boolean" use="optional"/>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:simpleType name="PropertyName">
     <xs:restriction base="xs:string">
       <xs:enumeration value="Subject"/>
       <xs:enumeration value="BodyAsPlaintext"/>
       <xs:enumeration value="BodyAsHTML"/>
       <xs:enumeration value="SenderSMTPAddress"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="ItemHasRegularExpressionMatch">
     <xs:complexContent>
       <xs:extension base="Rule">
         <xs:attribute name="RegExName" type="bt:NonEmptyString" use="required"/>
         <xs:attribute name="RegExValue" type="bt:NonEmptyString" use="required"/>
         <xs:attribute name="PropertyName" type="PropertyName" use="required"/>
         <xs:attribute name="IgnoreCase" type="xs:boolean" use="optional"/>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="ItemHasAttachment">
     <xs:complexContent>
       <xs:extension base="Rule"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:simpleType name="LogicalOperator">
     <xs:restriction base="xs:string">
       <xs:enumeration value="And"/>
       <xs:enumeration value="Or"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="RuleCollection">
     <xs:complexContent>
       <xs:extension base="Rule">
         <xs:sequence>
           <xs:element name="Rule" type="Rule" minOccurs="1" maxOccurs="unbounded"/>
         </xs:sequence>
         <xs:attribute name="Mode" type="LogicalOperator" use="required"/>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="UIControl" abstract="true">
     <xs:sequence>
       <xs:element name="Label" type="bt:ShortResourceReference" minOccurs="1" maxOccurs="1"/>
       <xs:element name="Supertip" type="Supertip" minOccurs="1" maxOccurs="1"/>
     </xs:sequence>
     <xs:attribute name="id" type="bt:ShortString" use="required"/>
   </xs:complexType>
   <xs:complexType name="UIControlWithIcon" abstract="true">
     <xs:complexContent>
       <xs:extension base="UIControl">
         <xs:sequence>
           <xs:element name="Icon" type="bt:IconList" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="UIControlWithOptionalIcon" abstract="true">
     <xs:complexContent>
       <xs:extension base="UIControl">
         <xs:sequence>
           <xs:element name="Icon" type="bt:IconList" minOccurs="0" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="Button">
     <xs:complexContent>
       <xs:extension base="UIControlWithIcon">
         <xs:sequence>
           <xs:element name="Action" type="Action" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="MenuItem">
     <xs:complexContent>
       <xs:extension base="UIControlWithOptionalIcon">
         <xs:sequence>
           <xs:element name="Action" type="Action" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="MenuItems">
     <xs:sequence>
       <xs:element name="Item" type="MenuItem" minOccurs="1" maxOccurs="unbounded"/>
     </xs:sequence>
   </xs:complexType>
   <xs:complexType name="Menu">
     <xs:complexContent>
       <xs:extension base="UIControlWithIcon">
         <xs:sequence>
           <xs:element name="Items" type="MenuItems" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="Group">
     <xs:sequence>
       <xs:element name="Label" type="bt:ShortResourceReference" minOccurs="1" maxOccurs="1"/>
       <xs:element name="Control" type="UIControl" minOccurs="1" maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:attribute name="id" type="bt:ShortString" use="required"/>
   </xs:complexType>
   <xs:complexType name="Tab" abstract="true">
     <xs:sequence>
       <xs:element name="Group" type="Group" minOccurs="1" maxOccurs="unbounded"/>
     </xs:sequence>
     <xs:attribute name="id" type="bt:ShortString" use="required"/>
   </xs:complexType>
   <xs:complexType name="OfficeTab">
     <xs:complexContent>
       <xs:extension base="Tab"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="CustomTab">
     <xs:complexContent>
       <xs:extension base="Tab">
         <xs:sequence>
           <xs:element name="Label" type="bt:ShortResourceReference" minOccurs="1" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="ExtensionPoint" abstract="true"/>
   <xs:complexType name="CommandSurfaceExtensionPoint" abstract="true">
     <xs:complexContent>
       <xs:extension base="ExtensionPoint">
         <xs:sequence>
           <xs:element name="OfficeTab" type="OfficeTab" minOccurs="0" maxOccurs="unbounded"/>
           <xs:element name="CustomTab" type="CustomTab" minOccurs="0" maxOccurs="unbounded"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="MessageReadCommandSurface">
     <xs:complexContent>
       <xs:extension base="CommandSurfaceExtensionPoint"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="MessageComposeCommandSurface">
     <xs:complexContent>
       <xs:extension base="CommandSurfaceExtensionPoint"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="AppointmentOrganizerCommandSurface">
     <xs:complexContent>
       <xs:extension base="CommandSurfaceExtensionPoint"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="AppointmentAttendeeCommandSurface">
     <xs:complexContent>
       <xs:extension base="CommandSurfaceExtensionPoint"/>
     </xs:complexContent>
   </xs:complexType>
   <xs:simpleType name="ST_RequestedHeight">
     <xs:restriction base="xs:integer">
       <xs:minInclusive value="32"/>
       <xs:maxInclusive value="450"/>
     </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="CustomPane">
     <xs:complexContent>
       <xs:extension base="ExtensionPoint">
         <xs:sequence>
           <xs:element name="RequestedHeight" minOccurs="0" maxOccurs="1" type="ST_RequestedHeight"/>
           <xs:element name="SourceLocation" type="bt:URLResourceReference" minOccurs="1" maxOccurs="1"/>
           <xs:element name="Rule" type="Rule" minOccurs="1" maxOccurs="1"/>
           <xs:element name="DisableEntityHighlighting" type="xs:boolean" minOccurs="0" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="FormFactor">
     <xs:sequence>
       <xs:element name="FunctionFile" type="bt:URLResourceReference" minOccurs="0" maxOccurs="1"/>
       <xs:element name="ExtensionPoint" type="ExtensionPoint" minOccurs="1" maxOccurs="unbounded"/>
     </xs:sequence>
   </xs:complexType>
   <xs:complexType name="Host" abstract="true"/>
   <xs:complexType name="MailHost">
     <xs:complexContent>
       <xs:extension base="Host">
         <xs:sequence>
           <xs:element name="DesktopFormFactor" type="FormFactor" minOccurs="0" maxOccurs="1"/>
         </xs:sequence>
       </xs:extension>
     </xs:complexContent>
   </xs:complexType>
   <xs:complexType name="Hosts">
     <xs:sequence minOccurs="1" maxOccurs="unbounded">
       <xs:element name="Host" type="Host"/>
     </xs:sequence>
   </xs:complexType>
   <xs:complexType name="VersionOverridesV1_0">
     <xs:sequence>
       <xs:element name="Description" type="bt:LongResourceReference" minOccurs="0" maxOccurs="1"/>
       <xs:element name="Requirements" type="bt:Requirements" minOccurs="0" maxOccurs="1"/>
       <xs:element name="Hosts" type="Hosts" minOccurs="0" maxOccurs="1"/>
       <xs:element name="Resources" type="bt:Resources" minOccurs="0" maxOccurs="1"/>
       <xs:element ref="mailor1_1:VersionOverrides" minOccurs="0" maxOccurs="1"/>
     </xs:sequence>
   </xs:complexType>
   <xs:element name="VersionOverrides" type="VersionOverridesV1_0"/>
 </xs:schema>