Exchange Online Admin API - future functionality?

Question

Hello, as I understand the Exchange Web Services (EWS) will be deprecated in October 2026.

Now the Exchange Online Admin API which is a RESP-based API (with limitations) should be used instead. Reference docs says:
"The API is built for these specific scenarios and doesn't replace the full Exchange administration surface in Exchange Online PowerShell."

We are currently using Exchange Online PowerShell since we need to be able to create Mail-enabled security groups which is not possible with either Graph API nor Exchange Online Admin API.
We call PowerShell from C# and it works however it is far from optimal so we hope for a proper REST API.

Question
Is there a plan to continuously implement Exchange Online PowerShell functionality so that the Exchange Online Admin API eventually will match Exchange Online PowerShell functionality?

Answer 1

To put it simply, no. Microsoft has stated few times over the past years that they are exploring possibilities, but they never go beyond that phase. For the time being, and the foreseeable future, we are stuck with PowerShell as the only supported solution for Exchange Online admin operations.

If you do not care about the "supported" bit, it is already possible to execute cmdlets without the need of the module, or PowerShell for that matter, by leveraging the InvokeCommand method. I have written about it on occasion, most recently here: https://michev.info/blog/post/5822/all-you-need-to-know-about-exchange-online-admin-api-or-how-to-run-cmdlets-without-powershell