David, there are literally hundreds of programs out there that convert one file to another including tiff files to pdfs. Googling tiff file print drivers will bring up most. LEADTOOLS ePrint is a good one.
But, I have to admit I don't think it is worth trying to convert all those files to PDFs. I would just stay with the tiff files that are there and change to pdf files now. tiff files are great for imaging, etc. but pretty much the standard is pdf. Adobe purchased tiff awhile back, and tiff hasn't been updated since 1992.
I guess it's how you look at it. I wouldn't consider 4GBs a problem; and I wound say it is par for the course. We have over 4GBs of pdfs on our server. It's still in a folder 1cm by 1cm compared to filling up entire chart racks. Purchase a TB hard drive, install it, move your AC folder, change all of the paths and be done with it. Now your ImportedItem folder is taking up 0.4% of your hard drive.
For now, PDF is to document files what I.E.7.0 is to Netscape. It's the industry standard. They make a ton of 3rd party PDF viewers which will do your conversions for you as well. I still prefer the real thing with Adobe Acrobat 8.0 which converts most anything to a PDF.
Hope this helps.
Cheers!
