Exchange: Mailbox Folder Size Report


As an Exchange Administrator, you can generate a mailbox folder size report for any user. It is extremely helpful if the USER doesn’t know how his/her mailbox is reaching size limit & which FOLDER has most emails.

Well here is the one-liner PowerShell script (Note: Replace username@company.com with user’s email address):

Get-MailboxFolderStatistics username@company.com | Select-Object FolderPath,@{Name="SubFoldersize";Expression={$r=$_.FolderAndSubfolderSize; [int] $a = ($r.Substring($r.IndexOf("(")+1,($r.Length - 2 - $r.IndexOf("("))) -replace " bytes","" -replace ",","") ; $a } } | Sort-Object SubFolderSize -Descending | Select-Object FolderPath,@{Name="Folder-and-Subfolder-Size";Expression={[String] $_.SubFolderSize + " MB"}}

The sample output shows this:

FolderPath                                       Folder-and-Subfolder-Size
 ----------                                       -------------------------
 /Scheduled Reports                               1625 MB
 /incoming Unapproved emails                      1165 MB
 /Audits                                          907 MB
 /Compliants                                      562 MB
 /Policy Violation Compliants                     551 MB
 /Deleted Items                                   482 MB
 /Server Activity Summary                         449 MB
 /VM Approval Requests                            236 MB
 /Approved Requests                               71 MB
 /New Accounts                                    61 MB
 /Profile Review                                  57 MB
 /Authorizations                                  35 MB
 /Rejected Content                                11 MB
 /Sent Items                                      8 MB
 /PersonMetadata                                  6 MB
 /Contacts                                        3 MB
 /Contacts/Recipient Cache                        3 MB
 /Calendar                                        0 MB
 /Drafts                                          0 MB
 /Quick Step Settings                             0 MB

You can export this to CSV file by adding “| Export-CSV -Path .\MBFolderSizeReport.csv -NoTypeInformation”. If it helped you, leave me a “Thanks” in the comments.

3 thoughts on “Exchange: Mailbox Folder Size Report

  1. Hey Anand, I tried running your script and got the below error. Something I’m doing wrong? Thanks for taking the time to share.

    At line:1 char:399
    + … th,@{Name=”Folder-and-Subfolder-Size”;Expression={[string]int + ” MB” …
    + ~~~
    Unexpected token ‘int’ in expression or statement.
    + CategoryInfo : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : UnexpectedToken

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