PFDAVAdmin is not around anymore with Exchange Server 2010 however the exchange team created a new tool called ExFolders.
Six or seven years ago, I was faced with several cases where the permissions on public folders had been made non-canonical by programs running against the M: drive. This was back in the Exchange 2000 days when IFS was still around, and it exposed the M: drive by default. At the time, the only fix we had for this situation was a painful manual process that had to be done one folder at a time. Since I was trying to learn C# at the time, I decided to write a tool to do a bulk fix as a learning exercise. That tool became PFDAVAdmin, so named because it used WebDAV to access and make changes to public folders, and because I kind of saw it as the successor to the old pfadmin/pfinfo tools. The tool soon grew to incorporate other functionality, including exporting/importing permissions and replica lists, exporting properties, enumerating items, accessing mailboxes, etc. PFDAVAdmin gained wide usage in Exchange Support, and an updated version was later released publicly. It wasn’t a pretty or polished tool, but it was extremely good at dealing with certain customer scenarios.
A few years later, PFDAVAdmin began showing its age. It had been written for .NET Framework 1.1, and because of Framework 2.0’s more restrictive XML parsing, I could not easily move it to the new Framework. It also relied on the presence of certain directory objects which were always there in Exchange 2000 and 2003, but were associated only with the CAS role in 2007.
Read more at source: http://msexchangeteam.com/archive/2009/12/04/453399.aspx
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