Outlook OfficeJs Addin - Webmail does not show "TabDefault" button

Question

I'm developing Outlook AddIn and I have a taskpane for MessageReadCommandSurface with one button. That works fine in Outlook Windows Desktop Classic, I see button on the ribbon. However, on outlook webmail (i.e. https://outlook.office.com/) button is not obviously there. User has to click on the "Apps" button and then it is there. But, I can see that some addins like ScriptLab and VivaInsights have buttons just next to the Reply/ReplyAll... buttons. How can we also achieve that?

Here is the excerpt from my manifest.xml:

<ExtensionPoint xsi:type="MessageReadCommandSurface">
              <OfficeTab id="TabDefault">
                <Group id="group.TB.MessageRead">
                  <Label resid="residGroupLabel"/>
                  <Control xsi:type="Button" id="btnShowTaskpaneTBRead">
                    <Label resid="residBtnLabelTB"/>
                    <Supertip>
                      <Title resid="residBtnLabelTB" />
                      <Description resid="residSupertipDescTB" />
                    </Supertip>
                    <Icon>
                      <bt:Image size="16" resid="Icon.16x16" />
                      <bt:Image size="32" resid="Icon.16x16" />
                      <bt:Image size="80" resid="Icon.16x16" />
                    </Icon>
                    <Action xsi:type="ShowTaskpane">
                      <SourceLocation resid="Trackingpane.Url"/>
                    </Action>
                  </Control>
                </Group>
              </OfficeTab>
            </ExtensionPoint>

How does ScriptLab put a button (or Menu button) here ?

I believe Outlook manages this automatically. On the web version, only one or two add-ins are displayed at a time. If you remove those, your add-in should appear. Also, if your add-in was installed before Script Lab or others, it might take priority. — M Junaid
– M Junaid, Commented Jun 7 at 17:20
Same happens if I don't have any other Add-in - it is not shown, I first have to click on "Apps" button and then I can click my Add-In TabDefault button. Is this maybe a reserved only for Microsoft internal Add-ins? Can someone from Microsoft confirm? — BTosic
– BTosic, Commented Jun 9 at 8:57
One workaround that we found is that there is a "Pin" option on right click (Apps->Our AddIn->Right Click). That will pin the icon (not the task pane itself) and then Icon will show next to the ScriptLab icon. Just to mention: our taskpane is not pinnable (and we don't want it to be pinnable) so, deliberately, we don't have SupportsPinning for it in manifest. Question is: can we do this programaticaly from OfficeJS or somehow in manifest.xml? — BTosic
– BTosic, Commented Jun 25 at 9:13
you need to add this line <SupportsPinning>true</SupportsPinning> after <SourceLocation resid="Trackingpane.Url"/> line in the manifest — M Junaid
– M Junaid, Commented Jun 25 at 11:18

M Junaid · Accepted Answer · 2025-06-29 05:16:51Z

0

this is an example what I was saying when you install an add-in from MS add-in Store it will ask you to pin it see the examples screenshots

unpinned example

when you will pin add-in and I think this is what you want add-in icon show with the email. After Publishing your add-in on MS add-in Store your add-in will have option to pin

edited Jun 29 at 5:16

answered Jun 28 at 4:39

M Junaid

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BTosic Jul 1 at 14:27

Thank you for engaging in my question. Install from App Source is certainly what we will do. So it seems there is no code or manifest changes possible to "auto pin" it, because our users might also skip this step. Thanks again, I appreciate your help.

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