large mailbox -- best practices

[mayak-cq]

hi all, 

just a quick note that i have a small law firm receiving copies of all
incoming mail to an archive at domain.com account.

drum roll -- the single mailbox is 65GB; the index file is 1.5GB

wow. 

it works -- mail consulted from sogo web mail client and i am running
2.4.17 on x64, but i am wondering what is the best way to split this up,
or, move it to a new directory and start a new archive ...

thanks

m
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