The script is available for download in Microsoft Script Browser for Windows PowerShell ISE. You need to install the Script Browser application first, and search for the script sample title.
This script is used to help administrator to get and set the EWS message size limit for Exchange 2010 and Exchange 2013.
The message size limit is set in web.config in IIS. This script will modify the value in the web.config file.
You can find more All-In-One Script Framework script samples at https://aka.ms/onescriptingallery