Hey, Scripting Guy! Blog - Use PowerShell to Troubleshoot Exchange Server Public Folders
Microsoft TechNet - Exchange 2013 - Limits for public folders
Microsoft TechNet - Exchange 2007 - How to View or Configure the Settings of Mail-Enabled Public Folders
The Exchange Team Blog - Updated Exchange Public Folder Guidance
Thoughtsofanidlemind's Blog - The dirty little secret about migration to modern public folders
Thoughtsofanidlemind's Blog - Exchange 2010 Public Folders: Part 1
Troubleshooting Exchange - Legacy Public Folder remnants in Exchange 2013 cause “The Microsoft Exchange Administrator has made a change…” prompt
TechNet Blogs » Doug's Think-Tank » Managing Exchange Public Folder Permissions
CodePlex - EXCHANGE PUBLIC FOLDER MIGRATION TOOL TO SHAREPOINT
CodePlex - Exchange Public Folder Poll and Extract
CodePlex - 2010-2013 Public Folder Migration Tool
CodePlex - PfRep helps the cleaning of Exchange Public Folders before they are migrated to SharePoint. The tool can also be also used for everyday cleaning operations as well.
CodePlex - SharePoint Migration Framework offers the tool Exchange Public Folder Extractor.
CodePlex - Microsoft Exchange Public Folder Migrator to Microsoft SharePoint (from 2007)