Added Files

Powershell/PowerShell-Office365Admin/Exchange/CheckMailboxStatsAccessAndPermissions.ps1

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+# Script to get details for a list of mailboxes and save that out to a CSV file
+#
+
+# File containing the list of mailboxes
+$inputFile = 'C:\Temp\MailboxList.txt'
+
+# File to save the results to
+$outputFile = 'C:\Temp\SharedMailboxes.csv'
+
+# Establish a session to Exchange Online
+$credentials = Get-Credential -Message 'Enter your Exchange Online administrator credentials'
+$connectionParams = @{
+    'ConfigurationName' = 'Microsoft.Exchange';
+    'ConnectionUri' = 'https://outlook.office365.com/powershell-liveid/';
+    'Credential' = $credentials;
+    'Authentication' = 'Basic';
+    'AllowRedirection' = $true
+} 
+$exchangeSession = New-PSSession @connectionParams
+Import-PSSession -Session $exchangeSession
+
+# Check output folder exists and create it if it doesn't
+$outputPath = (Split-Path -Path $outputFile)
+if (!(Test-Path -Path $outputPath)) {New-Item -Path $outputFolder -ItemType Directory}
+
+# If output file already exists, delete it.
+if (Test-Path -Path $outputFile) {Remove-Item -Path $outputFile}
+
+# Get the list of mailboxes from the file
+$mailboxes = Get-Content -Path $inputFile
+
+# Initialise the results table
+$mailboxesTable = @()
+
+# Iterate through the mailboxes from the file and show a progress bar as we go.
+foreach ($mailbox in $mailboxes) {
+    Write-Progress -Activity 'Checking..' -status $mailbox -percentComplete ($mailboxes.IndexOf($mailbox) / $mailboxes.Count * 100)
+
+    # Get the statistics for the mailbox.
+    $mailboxStats = ''
+    $mailboxStats = Get-MailboxStatistics -Identity $mailbox -ErrorAction SilentlyContinue -
+
+    # If mailboxStats is blank then mailbox doesn't exist, so that entry can be skipped. For all others get the mailbox permissions and build the output table.
+    if ($mailboxStats -ne $null) {
+        # Get permit permissions for users where the username has an @ in it, this filters out all the system permissions.
+        $usersWithAccess = (Get-MailboxPermission -Identity $mailbox | Where-Object -Property {($_.User -like '*@*') -and ($_.Deny -ne 'False')}).User -join '; '
+
+        $tableRow = New-Object System.Object
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'MailboxUPN' -Value $mailbox
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'MailboxType' -Value $mailboxStats.MailboxTypeDetail
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'ItemCount' -Value $mailboxStats.ItemCount
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'TotalItemSize' -Value $mailboxStats.TotalItemSize
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'LastLogonTime' -Value $mailboxStats.LastLogonTime
+        $tableRow | Add-Member -MemberType NoteProperty -Name 'UsersWithAccess' -Value $usersWithAccess
+        $mailboxesTable += $tableRow
+    }
+}
+
+# Output the final table of results to a file.
+$mailboxesTable | Export-Csv -Path $outputFile -NoTypeInformation
+
+# End the Exchange Online session
+Remove-PSSession -Session $exchangeSession