26.2M accounts from QIP (qip.ru) were exposed in this breach. Besides email addresses, it included passwords, which makes it a high-risk breach.
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Email addressesPasswordsUsernamesWebsite activity
In mid-2011, the Russian instant messaging service known as QIP (Quiet Internet Pager) suffered a data breach. The attack resulted in the disclosure of over 26 million unique accounts including email addresses and passwords with the data eventually appearing in public years later.
Source: Have I Been Pwned (CC BY 4.0)