Consolidating Accounts

I have recently discontinued use of three other machines and am now using only a desktop and a laptop.  I prefer to continue to use the “free” version of eM Client on these two machines. On both, I access two email accounts.  Is this legal within the eM constraints?  If so, how do I consolidate the activation number(s) to work on both machines.

As long as it is for personal use only, it is legal to use Free Licenses on more than one computer. 

To do that you need to have a separate Free License for each computer, as a single license can only be activated on one computer at a time.