I'm having to move 1000s of documents from a folder into the parent library, I'm wondering if this would cause any issues with version history, ownership of the documents or the modified by/date, check in /out? I would be moving the documents via Windows Explorer (using SharePoint 2010).
Unfortunately you are going lose all those metadata information that you are inquiring about :-(. Looks like you would need a 3rd party tool if keeping metadata info is important. Check following links for details. Hope this helps!