Recently I had to get the PFDAVAdmin Tool (which is used for managing permissions in Exchange 2003 settings) running on a new Windows 2012 R2 server.

I ran into issues where I would see the error:
Could not expand https://localhost/exadmin/admin/example.com/public%20folders/ : Name cannot begin with the ‘0’

Following some research, I found these articles on the tool which may be of interest to you:

• MSExchange.org PFDavAdmin tool Part 1
• MSExchange.org PFDavAdmin tool Part 2

The key was the need for computer to have the following installed to ensure correct operation of PFDAVAdmin.

• .NET Framework 1.1
• Exchange 2003 System Manager

NOTE: It is advised you do not run this tool from the Exchange Server its self due to the versions of .NET framework.

Hope this helps, if so please let me know.