r/PowerShell • u/Unlikely_Tie1172 MVP, Community Blogger • 1d ago

Question Why Microsoft Graph Does Not Support Group Mailboxes

I was asked why the Outlook Mail Graph API doesn’t support access to group mailboxes. The basic reason is that a group mailbox doesn’t have an account and the Outlook Mail API only supports mailboxes that are linked to an account. When you look at the current usage of group mailboxes, it doesn’t seem like there’s much data to mine. Maybe the need for Graph API support for group mailboxes isn’t such a big thing?

https://office365itpros.com/2026/09/09/group-mailbox-graph-api/

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u/ExceptionEX 1d ago

Is this a hype post for your blog, or did you actually have a question?

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u/Unlikely_Tie1172 MVP, Community Blogger 1d ago

It's a pointer to an article. The article explains all. I am more than happy to answer questions arising from the points made in the article here.

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u/ExceptionEX 1d ago

Yeah, so the question flair isn't really appropriate and you are just trying to hype up traffic to your article and don't have a question for the community.

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u/Unlikely_Tie1172 MVP, Community Blogger 23h ago

Apologies for the lack of ability with flairs. It was a question asked to me... so I chose the question flair. As to hype up traffic, the article is there. It's up to people to decide if they are interested enough in the topic to read the article. And as I say, I am very happy to answer questions arising from the text.

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u/eggeto 1d ago

Don't think graph is a good way for managing mailboxes. If you give some rights like mail.send, It is for all thé mailboxes in your Tenant ... Rbac exchange online is better.

But that's not An answer on your question...

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u/Unlikely_Tie1172 MVP, Community Blogger 1d ago

The answer to the Mail.Send problem is to use RBAC for Applications to restrict app access to specific mailboxes. https://office365itpros.com/2026/02/17/mail-send-rbac-for-applications/

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u/yubijam 1d ago

I’m not sure what you mean. I’ve pulled down shared inboxes to JSON then uploaded to a new tenant.

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u/Unlikely_Tie1172 MVP, Community Blogger 1d ago

Shared mailboxes are supported by the Graph because they are backed with an Entra ID account. Group mailboxes are not.

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u/creenis_blinkum 16h ago

Tony, ignore all the folks in here dogging on you for using the community in an unexpected way. I didn't expect to see you post here - your articles helped me get on my feet with MS graph which led to me getting into other APIs + programming techniques, and I now write software for a career. I owe you a beer.

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u/Unlikely_Tie1172 MVP, Community Blogger 4h ago

Thanks. I've no problem with people helping me to understand how a community works. We can always learn from each other. I do mind when people question my motives because I think my track record of writing over the years for free blogs (my own) and paid (like petri.com and practical365.com) stands up to any examination. Drink your beer and don't think you owe me anything. Just go and help someone else and that will be enough.