Export-ModernPublicFolderStatistics.ps1 script fails and returns a "ToBytes" error

Symptoms

After you install the November 2022 Microsoft Exchange Server security updates (SUs) or later SUs, you try to run Export-ModernPublicFolderStatistics.ps1, but the script fails and returns the following error message:

Method invocation failed because [System.String] does not contain a method named 'ToBytes'.

Workaround

To work around this issue, use one of the following methods.

Workaround 1

1. Open Export-ModernPublicFolderStatistics.ps1 in a text editor.

2. Search for and replace all occurrences of ToBytes() with ToString().Split("(")[1].Split(" ")[0].Replace(",","").

3. Save the modified content to a new file, such as Export-ModernPublicFolderStatistics-Temp.ps1.

4. Run Export-ModernPublicFolderStatistics-Temp.ps1.

Workaround 2

1. Open an elevated PowerShell session.

2. Load the Exchange Management PowerShell cmdlets by running the following command:

   Add-PSSnapin *Exchange*
   

3. Run Export-ModernPublicFolderStatistics.ps1.

Status

Microsoft is investigating this issue and will update this article when more information becomes available.