Added Files

Powershell/PowerShell-Office365Admin/ExchangeWithMFA/ResetCalendarDefaultPermissions.ps1

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+# Reset default calendar permissions to availability for a list of users.
+#
+# Uses the new PowerShell "module" that support MFA.
+#
+
+# File with list of users
+$userlistPath = 'C:\Temp\Userlist.txt'
+
+# Find and load the new ExO "module"
+$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 list of users
+$userlist = Get-Content -Path $userlistPath
+
+# Get mailboxes for users in list
+$mailboxes = Get-Mailbox -ResultSize Unlimited | Where-Object {$_.Name -in $userlist} | Sort-Object -Property Name
+
+# Check the mailboxes and reset any which have default permissions of None to AvailabilityOnly
+foreach ($mailbox in $mailboxes) {
+    $calendarPath = $mailbox.UserPrincipalName + ':\Calendar'
+    $defaultPermissions = Get-MailboxFolderPermission -Identity $calendarPath -User 'Default'
+    if ($defaultPermissions.AccessRights -eq 'None') {
+        Set-MailboxFolderPermission -Identity $calendarPath -User 'Default' -AccessRights AvailabilityOnly
+    }
+}
+
+# End the Exchange Session
+Get-PSSession | Where-Object {$_.ComputerName -eq 'outlook.office365.com'} | Remove-PSSession