The old Outlook saves it's contents to .OST and .PST files. AFAIK the Win7 mail app which I understand is not dissimilar to the Win8 one can import both these files providing of course you saved them.
Win8 is the new Vista, Windows2000, Win ME. It's the latest bad Windows version and best avoided if you can. I'll be getting a new PC in October and that will be installed with Win7 64bit because I'm not touching 8.
Win9 is supposed to be out before year end because Win8 has proved a disaster as it's more tablet orientated and useless for desktops. Win9 is supposed to bring back the bits of Win7 that are required for desktops.
Can you imagine business users trying to spend all day with their arms in mid air trying to touchscreen their way around
At the moment business will not touch Win8 or Office 2013. Office 2013 has big black and white touch buttons which reduces the 'in focus' options quite considerably and means most of the options are in sub menus which is a big time waster. Gone is colour because black and white shows up better on tablets.