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Outlook (New) failed to launch

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Posted on by blambodee

I'm using latest version of Automate and Outlook New from the MS Store. I'm on windows 10,

The Launch Outlook flow doesn't work. I tried with both having the Outlook app closed and opened befor running the flow.

Here's the error code:

Correlation Id: be7fe6c4-97d6-4378-a011-9a215ad66330 Value cannot be null. Parameter name: type: Microsoft.PowerPlatform.PowerAutomate.Desktop.Actions.SDK.ActionException: Failed to launch Outlook ---> System.ArgumentNullException: Value cannot be null. Parameter name: type at System.Activator.CreateInstance(Type type, Boolean nonPublic) at System.Activator.CreateInstance(Type type) at Microsoft.Flow.RPA.Desktop.Modules.Outlook.Actions.OutlookActions.LaunchOutlook(Variant& outlookInstance) --- End of inner exception stack trace --- at Microsoft.Flow.RPA.Desktop.Modules.Outlook.Actions.LaunchOutlook.Execute(ActionContext context) at Microsoft.Flow.RPA.Desktop.Robin.Engine.Execution.ActionRunner.Run(IActionStatement statement, Dictionary`2 inputArguments, Dictionary`2 outputArguments)

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Power Automate Desktop

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Deenuji_Loganathan_ 6,250 Super User 2025 Season 2 on at

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@blambodee

Please adhere to the troubleshooting guidelines below:
1. System restart to assess whether it rectifies the issues encountered.
2. Check if Outlook functions properly when opened manually. Consider reinstalling Outlook if any anomalies persist.
3. Reinstall Power Automate Desktop to ensure optimal performance.
4. Consider employing a workaround wherein you initiate Outlook via the Run application action and subsequently utilize Launch Outlook to establish an instance. This method ensures Outlook remains operational whenever you utilize Launch Outlook, thereby resolving potential functionality issues.

If nothing works please raise a ticket to Microsoft.

Thanks,
Deenuji Loganathan 👩‍💻
Automation Evangelist 🤖
Follow me on LinkedIn 👥

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VishnuReddy1997 2,656 Super User 2025 Season 2 on at

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Hi @blambodee ,

I tried in our system it launching the outlook.
Which version of PAD are you on? Have you tried reporting a bug to MS support?
Not sure if there is anything else we can help you with.

Try these steps once:
1. Just try to switch back old version of Outlook and try to launch it may works.
2. Uninstall and Reinstall the outlook.
3. You can also try with Run Application action once as shown in below image.

Meanwhile please report the issue to the Microsoft support.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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blambodee 7 on at

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I couldn't find the location of the Outlook app that I downloaded from Store, so I gave up. Anyway, I will report this bug to MS.

I ended up just use the send email with through Google server instead, albeit it is probably not as secured.

Thank you for your help.

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VishnuReddy1997 2,656 Super User 2025 Season 2 on at

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Hi @blambodee ,

No need to give the path in Run application mention outlook as shown in previous image it will launch the outlook.

(Note:- if you got your solution you can mark as solution and gives kudos)

Thanks & Regards
Vishnu Reddy

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Agnius Bartninkas Most Valuable Professional on at

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PAD does not currently support the New Outlook. If you absolutely need to automate Outlook, you will need to switch back to the "Old" Outlook for now. No idea as to when PAD will support the new version, but hopefully soon.

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RM-22071815-0 2 on at

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Gee... Just to confirm the same issue by trying to launch New Outlook. I was trying to translate the automation apps I have written with Google AppScript.

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