Mail not working on MBP or iMac

I can't believe I can't fix this
My mail on my two computer MBP, Mavericks and my iMac Mountian Lion will not send, recieve and my folders are gone
All my mobile devices work fine iPhone, iPad, Ipod touch
This happened after I upgraded to mavericks on my MBP
I did not install mavericks on my iMac because of a software I use does not support it
I tre entered all the settings from the icloud support page
It did used to call my mail account Mobile Me icloud. That is the only difference.
I can use icloud on the web as a work around but how do I get my Mac mail back
Thanks
MacBook Pro, Mac OS X (10.9.2), 2.44 GHz Intel Core 2 Duo 8GB ram
iMac, Mac OS X (10.7.5), 2.66GHz Intel Core 2 Duo 8 GB ram
iPhone 4S
iPad 2 Wi-Fi + 3G

I think I may have some insight as to what happened with the Mavericks update
It was previousy a Mobile Me account converted to iCloud when they ended the Mobile Me
They problaby ended support for that after the Mavericks update

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