Resubbing
Yes. Any time you apply the code from a boxed set to an account, you get the 30 days game time.
Note that each different boxed set can only be applied once to each account, so if you already have Architect Edition on the account in question, you can't apply it at all.
Also, NA and EU codes are not interchangable. If you already bought the NA box, you can't use its code on your EU account.
@Roderick
Yep. You'll get the free month assuming you have not already bought that edition of the game for that particular account, which doesn't sound like it'd be a problem for you.
Thanks for the replies, and no, never purchased the AE for my EU accounts, so looks like a nice deal.
+1 rep to both
Make sure what you're buying is an EU code, because NA codes don't work on EU accounts and vice-versa.
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I currently am using a US account but have decided to switch back to my EU account (due to having lots of alts, stuff and veteran rewards)
However.... if I purchase the mission architect pack online do I still get 30 days free on an already existing account (as that would work out cheaper than 30 days plus the magic pack)