Very behind Kernel / SPAM... Need help!!

HI,

We are very behind in kernel and SPAM. we are on 620 kernel and 0022 spam. I would like to know if we'd wanna upgrade, since the latest kernel is 7... can we upgrade directly to 7 kernel and spam or I have to upgrade spam of 620/0022 to 23 and upgrade kernel from 620 to 640 along with suport packs of 640 and then move forward to 7?

Please help!!

Thanks,