upper limit on messages in Mail app? and other questions...

[M A V I C]

Are these IMAP or POP accounts?

AlphaDog wrote:
Why in the world do any of you have that many messages?! Egad. If I was ever going to keep that many, I sure wouldn't have them stored on my own HD. ??? Is seems like there should be a much better way.

I've got more unread messages than he's got total messages. I've got well over 100k messages - nearly 10GB with attachments.