Microsoft 365 users get a blank page when they use Outlook Web App to access a shared mailbox
Original KB number: 2863260
Problem
Microsoft 365 users see a blank page when they try to access a shared mailbox by using Outlook Web App.
This problem occurs because you can't use Outlook Web App in Microsoft 365 to directly access a shared mailbox.
Solution
To open a shared mailbox in Outlook Web App, follow these steps:
- Sign in to the Microsoft 365 portal.
- Select Outlook.
- In the upper-right corner of the page, select the user name, and then select Open another mailbox.
- Type the name of the shared mailbox, and then select Open.
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