I use my powerbook almost exclusively for mail.app because I have several email accounts that I like to keep track of from one interface. I have been thinking of getting a Mac Pro and would also like to use Mail.app on it but also continue to use my powerbook when on the road. Is there a way to keep the mail boxes in sync between the two macs? I would hate to have some emails on the powerbook and others on the Mac Pro and inaccessible when on the road. Any help would be appreciated.