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Sometimes when i go to a question on SO it says "Locked by..." Another one is "closed as exact duplicate by" I was just curious as to how many different alerts like this a question can have on SO.

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Are you asking for a list of all the things that can be done to a question? Or just the "negative" ones? – Alenanno Jan 22 '12 at 20:10
The faq for stack exchange sites has items for protected, locked, closed and deleted questions. – Mat Jan 22 '12 at 20:15
up vote 3 down vote accepted

The question statuses with messages are:

  • Closed, which include Exact Duplicate, Off Topic, Not Constructive, Not a Real Question, Too Localized, General Reference, and Noise or Pointless. The last two only exist on a few sites. Closing disallows new answers.

  • Locked, which prevents all activity.

  • Deletion.

  • Bounty, which allows one to select from several messages as well as write a custom message to be appended.

  • Protection, which disallows new answers from users with less than 10 reputation from that site.

  • Migration from another site (migrations to are covered by Closed).

  • Moderator post notices such as insufficient explanation, current event, citation needed.

It is possible for a question to have at least 5 messages (migration from, mod notice, closed, locked, deleted) and perhaps 6 (above + protected), but a bounty cannot be active on a closed question.

As for what each of these states exactly are, there's an extensive here on Meta that you can browse.

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Also migration to/from another site and post notices (insufficient explanation, current event, citation needed). – Adam Lear Jan 22 '12 at 21:16
Deletion isn't final at all. Any post can be undeleted by moderator or 20K+ members. @Anna - there is also Historical Significance notice, though from my experience it usually does not help and the question get deleted anyway by other moderator who fails to see any significance. – Shadow Wizard Jan 23 '12 at 8:56
@Sha Historical significance is one of the notices added with a lock now, so it just falls under that here. – Adam Lear Jan 23 '12 at 12:58

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