What are the limits for local email storage with Postbox?

http://ift.tt/1udLh29

Right now I have a very large inbox archived with Mailstore Home Edition. I would like to move from using Mailstore as it appears that there is a limit of the amount of emails that I can store. Yes it is for personal use as I have several email addresses over the years.

The other day I picked up a copy of Postbox and I’m looking at moving everything to that. My only question is – can the mbox format handle very large mailboxes? What the max size can mbox handle?

Thank-you