Allow another user to open your mailbox (outlook 365)Mohammed Waseem·FollowOct 15, 2023--ListenShareFrom Admin CenterGo to https://admin.microsoft.com/#/users1. Go to Active Users2. Select a mailboxSelect Mail tabSelect Read and Manage permissionsClick Add permissionsSearch for the username that needs to open this user mailboxSelect the userClick AddDone, It will take around 30 minutes to work