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Can someone help me out that how I can fetch mails from Exchange User's mailbox using Microsoft Graph API?

Graph API is working fine for the online exchange users (O365) not for offline users (local users), but there is another problem too. Graph API provides Rest APIs by using which we can access each mailbox individually which will become very server loaded work if more than 1000K mailbox need to be scanned one by one and also a time taking process.

I want to fetch scan all user's mailbox at once both offline and online. Just like Microsoft Powershell do.

Is there any way to do so?

Any help will be deeply appreciated.

Thanks

Yashu Gupta
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  • It's impossible to get local mailboxes from an on-prem Exchange server using Graph. – bluuf Jun 01 '21 at 13:47
  • I partially agree with @bluuf. Incase if you're term local mailbox is meant for on-prem mailboxes then its doable. In such scenario, you can still make use of Microsoft Graph, incase if you're having Exchange hybrid setup (Exchange Online + onprem) and meet the requirements then you can make the use of the mailbox items from both the environments. You can get it [started from here](https://learn.microsoft.com/en-us/graph/hybrid-rest-support), check the requirements, do the necessary setup and the above functionality is in preview. – Dev Jun 02 '21 at 12:04

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