[ubuntu] Is there ANY way to archive old messages in Evolution?

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http://ubuntuforums.org – Hi all, can't figure out how this essential operation can be done in Evolution. Looking for any advice or comment on archiving old mail. I am running Evolution 3.2.3 on Ubuntu 12.04 Part of the problem was: during the upgrade from Ubuntu 10.04 to 12.04 and threrefore Evo 2.x.x to Evo 3.2.3 and into the new mbox format of email storage, something has acted up and I ended up with tripples and quadruples of thousands of messages, so I now have folders with 100,000+ messages and Evolution is crawling so slow, it's barerly useful. I don't have time to go through all multiple copies right no (Hardware)