Yesudass Moses Yesudass Moses - 1 year ago 116
C# Question

This addin caused outlook to start slowly

I am developing an Outlook Addin Project using C#.NET 4.5
But After I deploy, Sometimes outlook disables my addin, and shows this message.
"This addin caused outlook to start slowly"" I dont know whats wrong with my addin.
This has only a few codes, and ThisAddIn_Startup is empty in this project.
Here is the code...

public partial class ThisAddIn
private void ThisAddIn_Startup(object sender, System.EventArgs e)


private void ThisAddIn_Shutdown(object sender, System.EventArgs e)
protected override Microsoft.Office.Core.IRibbonExtensibility CreateRibbonExtensibilityObject()
return new Ribbon1();

#region VSTO generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InternalStartup()
this.Startup += new System.EventHandler(ThisAddIn_Startup);
this.Shutdown += new System.EventHandler(ThisAddIn_Shutdown);


<?xml version="1.0" encoding="UTF-8"?>
<customUI xmlns="" önLoad="Ribbon_Load">
<contextMenu idMso="ContextMenuContactItem">
<menuSeparator id="mniMailItemMenuSeparator" />
<button id="customButton"
label="Call using Software" insertBeforeQ="Copy"
önAction="OnMyButtonClick" />

<contextMenu idMso="ContextMenuMailItem">
<menuSeparator id="mailmenusep1" />
<button id="mailbutton" insertBeforeQ="Copy"
label="Call using Software"

önAction="MailItemCallNumbers" />



Answer Source

This can happen on an empty project if you build your add-in in debug mode and attach the debugger to it. The added time required to load all the symbols files into the debugger when it get attached might take longer than Outlook is expecting for a "stable" plugin to initialize.

You shouldn't worry about this unless it happens in a release build with no debugger attached. During development, you can simply tell outlook to never disable your plugin.

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