Although I'm running Exchange 2010 SP2, there apparently isn't a forum option for this version any longer.  I'm wanting to know if there is a way to create a report that would list all folders in a mailbox and the folder retention policy that is applied to each?  Actually, I've been asked if there is a way to create a report that would list all of the folders in all of the mailboxes of all of the users and the folder retention policy that has been assigned to each.

Sounds like you'd want to build some sort of Powershell script to accomplish part of this.  You could use:

Get-Mailbox | Sort-Object -Ascending RetentionPolicy | fl Name,RetentionPolicy

This would generate a nice list of users and the retention policy that is assigned to that mailbox and should sort them alphabetically.  This, however, won't reach into the mailbox and get folders and subfolders though.

Unfortunately it doesn't look like the Get-MailboxFolderStatistics cmdlet shows any retention policy or retention tag information.