As I mentioned in one of the recent posts, MS has released a PST capture tool that helps you migrate your users PST to Exchange 2010 archive mailboxes or Exchange online storage. Though I read some documentation of this tool to understand what it is and how it works, I could able to get clear idea only after reading below articles.
They covers the good amount of details in installing PST central service and deploying the agents for scanning the PST files on computers.
Part I – http://www.telnetport25.com/2012/02/installing-using-the-microsoft-pst-capture-toolpart-1/
Part II – http://www.telnetport25.com/2012/02/installing-using-the-microsoft-pst-capture-toolpart-2/