Too Many Database Identities in Outlook and Entourage

I've been using Entourage and now Outlook for the last 5 years and have accumulated 10G+ database size. As you can imagine, the databases have needed to be rebuilt multiple times over the years. This means I have well over 50G in old database identities. The problem is, they weren't all clean builds and this is why I retained the old databases. I am looking for a software that I can essentially feed all the identities into, and get one cleaned and merged identity database out the other side. I can then delete all other old databases. Does anyone know of any software or other tricks to make this happen? Have searched many times over the years on this and can't seem to track down an answer (other than running scripts within one database to clean duplicates). Thanks for your advice.