Background
I'm developing an Office addin for Outlook. I'm trying to add a button to the ribbon that should open a TaskPane. I've defined the ribbon button in my manifest, under the <Control> block of the XML:
<?xml version="1.0" encoding="UTF-8"?>
<OfficeApp xmlns="http://schemas.microsoft.com/office/appforoffice/1.1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="MailApp">
<Id>1bf213f9-65a5-4395-aef8-239d72c7e509</Id>
<Version>1.0.0.0</Version>
<ProviderName>myProviderName</ProviderName>
<DefaultLocale>en-US</DefaultLocale>
<DisplayName DefaultValue="myDisplayName" />
<Description DefaultValue="myDescription"/>
<Hosts>
<Host Name="Mailbox" />
</Hosts>
<Requirements>
<Sets>
<Set Name="MailBox" MinVersion="1.1" />
</Sets>
</Requirements>
<FormSettings>
<Form xsi:type="ItemEdit">
<DesktopSettings>
<SourceLocation DefaultValue="https://hiddenurl/app/index.html" />
</DesktopSettings>
</Form>
</FormSettings>
<Permissions>ReadWriteItem</Permissions>
<Rule xsi:type="RuleCollection" Mode="Or">
<Rule xsi:type="ItemIs" FormType="Edit" ItemType="Message"/>
</Rule>
<DisableEntityHighlighting>false</DisableEntityHighlighting>
<VersionOverrides xmlns="http://schemas.microsoft.com/office/mailappversionoverrides"
xmlns:bt="http://schemas.microsoft.com/office/officeappbasictypes/1.0"
xsi:type="VersionOverridesV1_0">
<Hosts>
<Host xsi:type="MailHost">
<DesktopFormFactor>
<ExtensionPoint xsi:type="MessageComposeCommandSurface">
<OfficeTab id="TabDefault">
<Group id="mainGroup">
<Label resid="groupLabel"/>
<Tooltip resid="groupsTooltip"/>
<Control xsi:type="Button" id="button">
<Label resid="buttonLabel"/>
<Tooltip resid="buttonTooltip"/>
<Supertip>
<Title resid="superTipTitle"/>
<Description resid="superTipDescription"/>
</Supertip>
<Icon>
<bt:Image size="16" resid="icon16"/>
<bt:Image size="32" resid="icon32"/>
<bt:Image size="80" resid="icon80"/>
</Icon>
<Action xsi:type="ShowTaskpane">
<SourceLocation resid="taskPaneUrl" />
</Action>
</Control>
</Group>
</OfficeTab>
</ExtensionPoint>
</DesktopFormFactor>
</Host>
</Hosts>
<Resources>
<bt:Images>
<bt:Image id="icon16" DefaultValue="https://hiddenurl/assets/icons/icon_16.png" />
<bt:Image id="icon32" DefaultValue="https://hiddenurl/assets/icons/icon_32.png" />
<bt:Image id="icon80" DefaultValue="https://hiddenurl/assets/icons/icon_80.png" />
</bt:Images>
<bt:Urls>
<bt:Url id="taskPaneUrl" DefaultValue="https://hiddenurl/app/index.html" />
</bt:Urls>
<bt:ShortStrings>
<bt:String id="tabLabel" DefaultValue="tabLabel" />
<bt:String id="groupLabel" DefaultValue="groupLabel" />
<bt:String id="groupsTooltip" DefaultValue="groupsTooltip" />
<bt:String id="buttonLabel" DefaultValue="buttonLabel" />
<bt:String id="buttonTooltip" DefaultValue="buttonTooltip" />
<bt:String id="superTipTitle" DefaultValue="superTipTitle" />
<bt:String id="superTipDescription" DefaultValue="superTipDescription" />
</bt:ShortStrings>
</Resources>
</VersionOverrides>
</OfficeApp>
I expect to see a button on the ribbon with my logo, which I should be able to click to open a TaskPane. However I see no button and under Office Add-ins / My Add-ins, my Addin is not even showing.
What I've tried
If I remove the entire <VersionOverrides> block in the manifest the Add-in shows up again under Office Add-ins / My Add-ins and I can access my TaskPane through there.
I've tried to follow these examples without success:
Questions
- What could be wrong with my manifest file?
- How can I verify that the manifest file declares the ribbon button correct?
- How can I verify that my manifest file is correct?
