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Is it possible to somehow access shared mailboxes in Office 365 via an API? It seems that Microsoft Graph doesn't provide a solution. Could anyone suggest something other than using PowerShell?

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1 Answers

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You can access Shared mailboxes using Exchange Online web services (EWS) in PowerShell. here is a sample on how to do this:

https://sites.utexas.edu/glenmark/2014/04/30/exchange-online-mailbox-access-from-powershell-via-rest/

Hope this helps.