[abrogard]

I have found a few suggestions on the web in reddit and other places but they go back years, more than ten sometimes, I think.

So I thought worth asking today to get today's preferred method?

And I should say not all my libraries were created by the latest version of calibre, if that makes any difference.

I don't have any customization to worry about.

All my libraries are in a mess and I'm looking to get all books together in one place and up to date and settle down to cataloguing and such.

So first: how to get them all into one library?