Exchange Online PowerShell Module: Application cannot be started. Contact the application vendor.


When installing Exchange Online PowerShell Module from the Exchange Online Admin Center (hybrid menu option), I got the following error:

Cannot Start Application

Application cannot be started.  Contact the application vendor.


Clicking Details opens a log file, giving you a summary of the error:

Below is a summary of the errors, details of these errors are listed later in the log.
* Activation of C:\Users\SB\Downloads\Microsoft.Online.CSE.PSModule.Client.application resulted in exception. Following failure messages were detected:
+ Deployment and application do not have matching security zones.


The Exchange Online PowerShell Module is being installed from an Application Manifest.

Chrome was preventing the .exe file from running, mistaking it as a security risk.  I expect Firefox would do the same.

I switched to Edge to install the application.

Do you want to open Microsoft.Online.CSE.PSModule.Client.application (15.6 KB) from  Click Open.


Do you want to install this application?  Click Install.


Sorted 🙂


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