Donny's questions

I recently upgraded from Communicator 2007 to 2007 R2. I notice that the conversations saved to Outlook Conversation History folder occupy much more space (~ 10x-20x) than they used to. For example, a simple 5-line convo between 2 people would take 4K in Communicator 2007. In R2, the same convo takes 50K. That might seem small, but I'm a big Communicator user, and my work inbox has a quota. I know, I can archive stuff. But I'd like to know why the big increase in size, and is there a way around it? Thanks.