Given many companies running notes push forms out to their web site, I am curious, does now knowing this key increase the vulnerability of Lotus Notes servers everywhere as theoretically anyone can use it now?
That applies to versions of Notes and Domino prior to R5.0.4, since which there has only been one version (outside of France, at least, which didn't authorise import until October 2000 -- that's due to France's crypto import regulations at the time, not the USA's crypto export regs). This back door ceased to exist more than a dozen years ago, and the current international key length is more than 64 bits (4096 bits for users/servers, 8192 bits for certifier ids).