I use 2.8.1 and when I tried to install the scanner on Vista I could have screamed! I finally gave up on vista because the neat receipts scanner would work. I refused to up to 3.xx because 2.8.1 did what it was supposed to do, on XP.
SO-
Here we are into the third quarter of 2008. Will 4.0 use the 2.8.1 database and integrate successfully? Because I don't want to rescan three quarters worth of documents, business cards and receipts. Still using XP Pro on both desk and notebook. If you can guarantee me this, I buy the new scanner and software if it's reasonable.