Hi ngelsa,
So as per my understanding , LMO which opinion date expires could also be used for claiming 600 points in Express Entry. As I am on Work Permit and I was confused that if I have to get a new LMIA from my employer or I can use the same old LMO on basis of which I got my Work permit.
Further more can you specify any other documents required while submitting the original PR application in express entry after getting the invitation to apply for PR.