Scenario 1: The manager and delegate mailboxes are added to the same profile Additionally, this section provides the steps that you can follow to resolve or to work around these issues. This section describes the two scenarios in which unexpected behavior can occur when you use the Outlook feature that lets you add multiple Exchange accounts to the same profile. This article describes two distinct scenarios in which this feature can cause unexpected behavior: 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.