Added Files

Powershell/PowerShell-Office365Admin/ExchangeWithMFA/GetSharedMailboxPermissions.ps1

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+# Find shared mailboxes on the basis of their email domain and lists of who has access to them
+#
+# Uses the new PowerShell "module" that support MFA.
+#
+
+# Where to save the CSV files to
+$outputPath = 'C:\Temp\'
+
+# Wildcard for mailboxes to find
+$searchWildcard = '*'
+
+# 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 the mailboxes we're looking for
+$sharedMailboxes = Get-Mailbox -RecipientTypeDetails SharedMailbox -ResultSize Unlimited | Where-Object {$_.PrimarySmtpAddress -like $searchWildcard} | Select-Object Name,Alias,PrimarySmtpAddress,ProhibitSendQuota
+
+# Export list of mailboxes to CSV File
+$sharedMailboxes | Export-CSV -Path ($outputPath + 'Shared Mailboxes.csv') -NoTypeInformation
+
+# Get all non-inherited permissions excluding self and output to a CSV file named for each group
+foreach ($sharedMailbox in $sharedMailboxes) {
+    $mailboxPermissions = Get-MailboxPermission -Identity $sharedMailbox.alias | Where-Object {$_.IsInherited -eq $false -and $_.User -ne 'NT AUTHORITY\SELF'} | Select-Object Identity,User,AccessRights,Deny
+    $mailboxPermissions | Export-CSV -Path ($outputPath + $sharedMailbox.Name + '.csv') -NoTypeInformation
+}
+
+# End the Exchange Session
+Get-PSSession | Where-Object {$_.ComputerName -eq 'outlook.office365.com'} | Remove-PSSession