Can anyone offer me a solution to the problem I have encountered as detailed below.

One of our organisations has decided to convert all of its paper documentation to an electronic format.  The documentation has already been scanned and the chosen format is PDF.

I have identified the following processes that the department needs to be able to integrate into their work patterns

Scan in new docs

Search, open and apend to existing docs

Search and change metadata on existing docs

The solution that I have put together so far is as follows.

I have created a number of document libraries on the organisations site, these are for the different departments within the organisation.  New PDFs are created using Adobe Acrobat Pro, saved to a shared area then uploaded to the relevant document library.  Adobe Acrobat is also used to add to the existing PDFs but the process is very messy as the document has to be opened saved to the shared folder then uploaded again (this is done to maintain versioning information).

The problems encountered are:-

Adobe Acrobat Pro does not fully integrate with Sharepoint, cannot save PDFs directly to a Sharepoint Document Library or update Metadata.

The document libraries contain thousands of PDFs, the search results page only give you access to a link and does not display file metadata which needs to be changed. (scrolling through thousands of files is not an efficient method of searching to update this information.) 

I am looking for some advice on any third party PDF software that will fully integrate with MOSS 2007 so that the processes are seamless for the personnel carrying out the work and any advice on a search method to access file metadata would be gratefully recieved.