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I have created an VSTO Outlook addin. The configuration is as follows:

  • Visual Studio 2008
  • Office 2007 Outlook add in (3.5 Framework)
  • MSI created using Visual Studio Setup Project
  • Deployed to Office 2010 under windows 7

It works fine on the Dev PC however it fails to load once installed on the test machine. The outlook addin window shows a "Not loaded. A runtime error occurred during loading of COM add-in"

It is my understanding that I should not need to install any PIA as the Office 2007 PIA are part of Office 2010.

So far I have tried the following:

  • set VSTO_SUPPRESSDISPLAYALERTS however it does not show any messages when it tries to start.
  • configured Fuslogvw.exe (Assembly Binding Log Viewer) however it is not showing any binding errors.
  • set VTSO_LOGALERTS and it is logging all alerts however as none are shown this has not helped.

Is there anything I am doing wrong or need to do in addition to make this work?

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  • what version of vsto is installed on test machine? Commented Jul 10, 2012 at 6:25
  • For what I had read it had intially suggested that 2010 comes with VSTO 3.0 installed. I had tried to install the 3.0 runtime however this would not install. I am goign to try the 2010 runtime microsoft.com/en-us/download/details.aspx?id=20479 as suggested by msdn.microsoft.com/en-us/library/ff937654.aspx Commented Jul 10, 2012 at 7:22
  • 1
    think VSTO 2010 RT is required for office 2010 addins Commented Jul 10, 2012 at 8:18
  • Installing the 2010 runtime did not help make any difference. Commented Jul 12, 2012 at 10:57
  • Are you sure the error isn't from the addin itself (like an unmanaged exception at startup) I have for ex, an addin that get disabled by office because of a timeout on an SqlConnection... Commented Jul 13, 2012 at 13:27

2 Answers 2

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Make sure you have the VSTO 3.0 Runtime installed on the test machine.

You will also need to install the VSTO 3.0 Runtime Service Pack 1 if you are running Visual Studio 2008 Service Pack 1.

VSTO 4.0 Runtime is not required in your situation because it is used with add-ins created with Visual Studio 2010. Please note that the version of VSTO and runtime generally must agree with the version of Visual Studio used to create the add-in.

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6 Comments

This requires 0ffice 2007 to be installed - microsoft.com/en-us/download/details.aspx?id=23656
Yes, just checked. The VSTOR30 (Visual Studio Tools For Office Runtime) is needed because you built an Office 2007 add-in, even though you are running it on Office 2010.
@John, by the way, I've developed an Outlook 2007 add-in which I run on both Outlook 2010 and Outlook 2007. VSTOR30 is required on both, and Outlook won't get to even the first line of code in your add-in without it. Make sure your test machine has the Pre-reqs for the VSTO Redist, namely .NET Fx 3.5.
@John, also, if you are using VStudio 2008 SP1, then you need to be using VSTOR30 SP1 and .NET Fx 3.5 SP1. Makes for a painful install process, but that appears to be what MS requires.
It works, thank you for your help. Turns out VSTO 3 need to be installed and then SPK1 after it.
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ere are a couple of usefull sites (I'm not going to copy and paste their advice on troubleshooting) http://www.ceptara.com/node/183

http://blogs.msdn.com/b/vsod/archive/2008/04/22/troubleshooting-com-add-in-load-failures.aspx

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