Made a mess of mail, please help

Hi everyone. I switched from PC to iMac last year, and here is my situation.

I use mail on my iMac. I have it set up to check my pop mail for my private email address (username@mydomain.com) and my hotmail (username@live.com) and both of those are set to leave a copy of all messages on their servers. I have an iCloud address but I have never used it.

I have not yet confugured mail on my MacBook, my iPad or my iPhone.

I am moving overseas next month for about 8 months and I can't take my iMac with me. If that wasn't heart breaking enough, I don't quite know what to do to manage everything while I am away and my iMac is asleep in a carton. I will be taking my Air, phone and pad. Can anyone please suggest a nice way for me to manage my emails while I am away?

I would like to have access to all my archives, plus all my new emails in one place, and particularly I like all my replies and outgoing messages to come from myusername@mydomain.com. And, I would like all of my mail to be easy to sync to my iMac when I get home in 8 months time.

I understand that I can just use the various providers web sites and read and write there, but I was hoping for a nice solution that allowed for offline work too.

Any suggestions? What would you do?

Thanks so much...

Brett