If you are using Office 365 Exchange Online for room mailboxes and you have a need to reset the password, then you can run this simple PowerShell command to reset it. Remember to use your Exchange Online PowerShell app especially if you have Multi Factor Authentication enabled.
$pwd="PutAPasswordHere" Set-Mailbox -Identity firstname.lastname@example.org -RoomMailboxPassword (ConvertTo-SecureString -String $pwd -AsPlainText -Force) -EnableRoomMailboxAccount $true
That’s it, simple change and you can test in Outlook Web Access via https://outlook.office365.com
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