Import Mail from one iMac to Macbook Pro

Hi All,

I need to transfer all my mail from my iMac over to my Macbook Pro.

I don't need any preferences or rules etc. I just need access to them for reference purposes.

I'm aware that I can export a mailbox from the iMac, transfer the file and import it on to the Macbook Pro.

I have two questions:

1. Its quit a large set of emails, totaling over 10,000 over about 8 years. Will this cause a problem?

Not sure of the GB size as I don't currently have access to the iMac.

2. I've heard that there may be permission issues with this. Is there anything I should be aware of?

Both computers are mine, but my administrator name is different I think. They're both snyc'd via iCloud though. (except Mail :-)

MacBook Pro, OS X Mavericks (10.9.4), 2.4 GHz Intel Core i5

iMac (27-inch Late 2009), OS X Mountain Lion (10.8.2), Nikon D600, Nikon D90

Thanks for your help.

Richard