Added Files

Powershell/PowerShell-Office365Admin/ExchangeWithMFA/AddRoomCalendarEditors.ps1

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+# Create a group and add it to all room mailboxes as an editor
+#
+# Uses the new PowerShell "module" that support MFA.
+#
+
+# What do you want the editors group to be called?
+$editorsGroup = 'Calendar Editors'
+
+# Who do you want to be in the group? This can be 1 or more people.
+$editorsMembers = @('','')
+
+# Find and load the new ExO "module"
+$exoModulePath = (Get-ChildItem -Path $env:userprofile -Filter CreateExoPSSession.ps1 -Recurse -Force -ErrorAction SilentlyContinue).DirectoryName[-1]
+. "$exoModulePath\CreateExoPSSession.ps1"
+
+# Establish a session to Exchange Online
+Connect-EXOPSSession
+
+# Get all room mailboxes in the organisation
+$roomMailboxes = (Get-Mailbox -RecipientTypeDetails RoomMailbox).Alias
+
+# If the editors group doesn't exist, create it.
+if (!(Get-DistributionGroup -Identity $editorsGroup -ErrorAction SilentlyContinue)) {
+    New-DistributionGroup -Name $editorsGroup -Type Security
+}
+
+# Add members to the group
+$existingMembers = Get-DistributionGroupMember -Identity $editorsGroup
+foreach ($editorsMember in $editorsMembers) {
+    if ($editorsMember -notin $existingMembers.Name) {
+        Add-DistributionGroupMember -Identity $editorsGroup -Member $editorsMember
+    }
+}
+    
+# Add the permissions to the mailboxes
+foreach ($roomMailbox in $roomMailboxes) {
+    $calendarFolder = $mailboxAlias + ':\calendar'
+    Add-MailboxFolderPermission -Identity $calendarFolder -User $editorsGroup  -AccessRights Editor
+}
+
+# End the Exchange Session
+Get-PSSession | Where-Object {$_.ComputerName -eq 'outlook.office365.com'} | Remove-PSSession