FYI There is a spam email doing the rounds which points to a phishing site.
The spam email is completely bogus and has various titles, including:
"Critical wallet update"
"Unlock bitcoin limits & new exchange tool"
No doubt there will be other titles as time goes on.
The phishing site the spam email points to has two letters reversed compared to the proper site name of
https://multibit.orgIf you do receive any spam of this sort ignore it.