Outlook addin not loading on second instance

Question

I have successfully created an addin for Outlook which shows/hides a custom task pane using a ribbon toggle button by following this link.

The problem I have is it works fine for one instance of Outlook, but as soon as I open another instance pressing the ribbon button only controls the addin on the first instance.

The ribbon code:

    public partial class ManageTaskPaneRibbon
    {
    private void ManageTaskPaneRibbonLoad(object sender, RibbonUIEventArgs e)
    {
        btnToggle.Tag = Guid.NewGuid().ToString();
    }

    private void BtnToggleClick(object sender, RibbonControlEventArgs e)
    {
        Globals.ThisAddIn.TaskPane.Visible = ((RibbonToggleButton)sender).Checked;
    }
    }

I need the 2 instances to be completely separate in operation so they can work independently from each other.

Dmitry Streblechenko Dmitry Streblechenko · Accepted Answer · 2015-12-21T18:02:10

When Application.Explorers.NewExplorer event fires, create a new task pane for that instance of the Explorer object.

Outlook addin not loading on second instance

1 Answers