Hi guys,

The reason your Google accounts have been required to change the password is that you appeared in a list of public MtGox accounts. We do understand that you may not have been sharing your passwords, unfortunately as they were leaked in hashed form it is hard to know which ones will be found to be sharing passwords and which won't - this will be found out by brute forcers over the next 24-48 hours.

Again, apologies for the inconvenience, we know that choosing new passwords is a pain. Requiring password rotations is not a decision we take lightly. However this is standard procedure for credentials leaks. It is to avoid accounts showing up in the black market for hacked passwords, as Gmail account access can be used to obtain access at other sites (PayPal, Facebook, etc).

thanks,

Mike
Google abuse/anti-hijack team