What is the size limit of mbox files in Leopard Mail 3.0 ?

What is the file size limit of mbox files in Leopard Mail?
e.g. a main folder -- that contains no actual emails -- but contains many sub-folders each of which have an mbox file.
Each mbox file has a limit, but because the main folder has several mbox files/subfolders, it means that the size of the main folder gets very large.
Question: is there is a size limit for the main folder, even though there is no mbox file associated with the main folder (since it merely acts as a folder for subfolders)?
Question: what is the practical limit for each mbox file -- theoretical and practical? i.e. what size should we not exceed in order to avoid corruption?

I've been researching for the same answer. And technically speaking, I don't have one. In the past, I've "heard" that the mailbox size limit was something like 1GB for Mail (OS X 10.3) and then something like 2-4GB for Mail (OS X 10.4). I have searched all over the place in technical documentation and can't really get a good answer. I'm almost leaning towards believing that there is no limit, based on the fact that the database that mail is using (particularly for OS X 10.4) is BerkeleyDB 4.2.52 and that DB doesn't have a size restriction. I'm not sure if that is the only factor involved though. I've tried researching the limits for KMail, which is the mail program that runs on KDE (Linux), which is the program that Mac OS X Mail is based off of... and I can't find anything there either. Most people say, "It's a free app, so don't expect much," but I'd rather use Mac OS X Mail than most anything else. I hope that maybe someone from Apple... or someone else who can reference technical documentation can help out. Thanks!

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