I received an email from Ubisoft; the following is an excerpt of the relevant information:

"Dear Member,

We recently found that one of our Web sites was exploited to gain unauthorised access to some of our online systems. We instantly took steps to close off this access, investigate the incident and begin restoring the integrity of any compromised systems.

During this process, we learned that data had been illegally accessed from our account database, including user names, email addresses and encrypted passwords. Please note that no personal payment information is stored with Ubisoft, meaning your debit/credit card information was safe from this intrusion.

As a result, we are recommending that you change the password for your account"

I am ashamed to admit that my first response upon reading this email was - "I had an account with Ubisoft?". Luckily, the aforementioned email had a link which allowed me to set a new password without requiring to enter in my old (forgotten) password. I guess it is finally time for me to look at what password managers are available so that I won't be caught out if something like this happens again.