I have an old wallet (created with official client, version 0.4 or so) where I like to keep the address, because it has been given away and may still receive sometimes.

When I import it into Electrum (as no deterministic wallet) will the BTC stay safe or do I have to get 0.8.1 of the official client for that?

Electrum isn't affected by this May 15 debacle at all?