203K accounts from Win7Vista Forum (win7vista.com) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesInstant messenger identitiesIP addressesNamesPasswordsPrivate messagesUsernamesWebsite activity
In September 2013, the Win7Vista Windows forum (since renamed to the "Beyond Windows 9" forum) was hacked and later had its internal database dumped. The dump included over 200k members’ personal information and other internal data extracted from the forum.
Source: Have I Been Pwned (CC BY 4.0)