Use of the same email database from different macs (Mac Mail)

I want to use the same database of Mac Mail (and the settings of it aswell), which should be situated on the external drive, in two different MacBooks.

So I can connect my HDD to one of the Macs, run the Mac Mail and work with the same emails, which are stored locally on this connected HDD. I use pop3/smtp for several different emails and got tons of business email since 2000 and now have to use The Bat Portable on Win, running through Parallels.

If anyone got the solution, I'd appreciate, cause I want to make the use of Parallels less as I can.

P.S. The one Macbook of mine runs Lion, another - Mavericks, so the Mail clients have different versions 🙂

Thanks!