New script to retrieve folder statistics for mailboxes with large numbers of folders

M365/Get-LargeMailboxFolderStatistics.ps1

@@ -0,0 +1,72 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+#Requires -Modules @{ ModuleName="ExchangeOnlineManagement"; RequiredVersion="3.4.0" }
+
+<#
+.SYNOPSIS
+    Retrieves folder statistics for mailboxes with large numbers of folders.
+
+.DESCRIPTION
+    This script retrieves folder statistics for large mailboxes or a specified user identity.
+    It can target either primary or archive mailboxes and processes the data in batches.
+
+.PARAMETER Identity
+    The identity of the user whose mailbox folder statistics are to be retrieved.
+
+.PARAMETER MailboxType
+    Specifies the type of mailbox to target. Valid values are "Primary" and "Archive".
+    Default is "Archive".
+
+.PARAMETER BatchSize
+    Specifies the number of items to process in each batch. Default is 5000.
+
+.PARAMETER Properties
+    Specifies the properties to include in the output. Default is "Name, FolderPath, ItemsInFolder, FolderSize, FolderAndSubfolderSize".
+
+.EXAMPLE
+    $folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected]
+    $folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected] -MailboxType Primary
+    $folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected] -MailboxType Archive -BatchSize 5000 -Properties @("Name", "FolderPath")
+#>
+param(
+    [Parameter(Mandatory = $true, Position = 0)]
+    $Identity,
+    [Parameter(Mandatory = $false, Position = 1)]
+    [ValidateSet("Primary", "Archive")]
+    $MailboxType = "Archive",
+    [Parameter(Mandatory = $false, Position = 2)]
+    $BatchSize = 5000,
+    [Parameter(Mandatory = $false, Position = 3)]
+    [string[]]$Properties = @("Name", "FolderPath", "ItemsInFolder", "FolderSize", "FolderAndSubfolderSize")
+)
+
+process {
+    $allContentFolders = New-Object System.Collections.Generic.List[object]
+    $start = Get-Date
+    Write-Host "$start Running Get-MailboxFolderStatistics for $Identity $MailboxType locations, in batches of $BatchSize"
+
+    $mailboxLocations = Get-MailboxLocation -User $Identity
+
+    foreach ($location in $mailboxLocations) {
+        if (($location.MailboxLocationType -like '*Archive' -and $MailboxType -like 'Archive') -or ($location.MailboxLocationType -like '*Primary' -and $MailboxType -like 'Primary')) {
+            $loopCount = 0
+            do {
+                $skipCount = $BatchSize * $loopCount
+                $batch = Get-MailboxFolderStatistics -Identity $($location.Identity) -ResultSize $batchSize -SkipCount $skipCount
+                [System.Array]$contentFolders = $batch | Where-Object { $_.ContentFolder -eq "TRUE" } | Select-Object -Property $Properties
+                if ($contentFolders.Count -gt 0) {
+                    $allContentFolders.AddRange($contentFolders)
+                }
+                Write-Host "$(Get-Date):$loopCount Found $($batch.Count) content folders from $($location.MailboxLocationType):$($location.MailboxGuid)"
+                $loopCount += 1
+            }
+            while ($($batch.Count) -eq $BatchSize)
+        }
+    }
+
+    $end = Get-Date
+    Write-Host "$end Found $($allContentFolders.Count) total content folders in $(($end-$start).ToString()) duration"
+
+    $allContentFolders
+}

docs/M365/Get-LargeMailboxFolderStatistics.md

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+# Get-LargeMailboxFolderStatistics
+
+Download the latest release: [Get-LargeMailboxFolderStatistics.ps1](https://github.com/microsoft/CSS-Exchange/releases/latest/download/Get-LargeMailboxFolderStatistics.ps1)
+
+
+This script runs the Get-MailboxFolderStatistics cmdlet and works around the problem of cmdlet timeouts where there are a large number of folders in the mailbox. This is particularly useful with mailboxes with more than 10k folders, especially Archive mailboxes.
+Although it can work with both Primary and Archive mailboxes.
+
+By default the script will try and retrieve the folder statistics for a user's Archive mailbox. It will retrieve the folders in batches of 5000 and just retrieve the commonly required properties Name, FolderPath, ItemsInFolder, FolderSize, FolderAndSubfolderSize.
+
+
+#### Syntax:
+
+Example to get the mailbox folder statistics for an Archive mailbox.
+```PowerShell
+$folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected]
+```
+
+Example to get the mailbox folder statistics for a Primary mailbox.
+```PowerShell
+$folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected] -MailboxType Primary
+```
+
+Example to get the mailbox folder statistics for a Archive mailbox, in batches of 5000 and just the folder properties Name and FolderPath
+```PowerShell
+$folderStats = .\Get-LargeMailboxFolderStatistics.ps1 -Identity [email protected] -MailboxType Archive -BatchSize 5000 -Properties @("Name", "FolderPath")
+```
+
+
+
+##### Further information <br>
+
+The sweet spot seems to be retrieving folders in batches of about 5000 at a time. This prevents cmdlet timeouts but also achieves a good overall run time.
+
+The script has been used successfully against archives mailboxes with up to 60K folders.
+

mkdocs.yml

@@ -79,6 +79,7 @@ nav:
     - MDO:
       - MDOThreatPolicyChecker: M365/MDO/MDOThreatPolicyChecker.md
     - DLT365Groupsupgrade: M365/DLT365Groupsupgrade.md
+    - Get-LargeMailboxFolderStatistics: M365/Get-LargeMailboxFolderStatistics.md
   - Performance:
     - ExPerfWiz: Performance/ExPerfWiz.md
     - ExPerfAnalyzer: Performance/ExPerfAnalyzer.md