I was just tasked with the project to implement In-Place archiving in our Exchange 2013 environment. Right now Im searching for a good known tool that will assist with scanning users hard drives and migrate their .pst files to their In-Place archiving mailbox. So far I have found one, Sherpa Software, but if possible I would like to take a look at a few and compare them. If anyone knows of any products that will assist with this type of task please let me know. I will really appreciate it.

Try this MS product

Search for PSTs Using PST Capture

https://technet.microsoft.com/en-us/library/hh781034(v=exchg.141).aspx