Creating Resource Mailboxes in Office 365

To create a resource mailbox in Office 365, you will need access to your administrator account.
Go to https://admin.microsoft.com/ to log into your admin portal using your administrator credentials.
On the left side of your screen, expand the Admin center and click on Exchange.
Your Exchange dashboard should look similar to below. Click on resources under recipients.

Open

Click on the + icon to add a new resource and choose Room mailbox when given the choice.

Open

Fill in the details required when a new page opens and click Save.

The new resource should now be created and listed. Select the newly created resource and click on the edit icon.

Go to booking delegates and ensure that Booking requests are set to Accept or decline booking requests automatically and click Save.