However, you know the credentials to access the additional Exchange mailbox.
You have Full Access permission to the additional Exchange mailbox.You can add an additional Exchange account if one of the following conditions is true: Microsoft Outlook 2010, Outlook 2013, Outlook 2016, Outlook 2019 and Outlook for Office 365 let you add multiple Microsoft Exchange accounts to the same profile. Applies to: Outlook 2019, Outlook 2016, Outlook 2013, Microsoft Outlook 2010, Outlook for Office 365.Issues that can occur when you add multiple Exchange accounts in the same Outlook profile
