- Will inactive accounts be deleted?
- If so, what happens to questions and answers made by those accounts?
- What are the criteria for deletion?
Source: the Stack Overflow blog
Accounts which are deemed to be abandoned will be deleted, and the user information on their questions and answers will be denormalized into text fields.
Cookie-based unregistered accounts will be deleted when:
OpenID registered accounts will be deleted when:
See this blog post for further details/discussion.