SharePoint 3.0: Clarifying Check Out Status on Multiple Document Upload

I found a post on TechArchive.net, "Re: disabling check out on document library upload," in which the author was observing that multiple document uploads were resulting in status of "checked out" after uploading. The author cited a post of mine, "SharePoint V3: Achieving Checked-In Status When Uploading Mulitple Documents," and explained that the post didn't solve the issue.

So, I am posting the two possible reasons why, after uploading multiple documents to a document library, the uploaded documents have the status of "checked out."


1. Require check out is configured on the library

I did a test, configuring six document libraries, and then performed a multiple document upload. Here are the results:

a.
Document library configurations resulting in "checked out" status when multiple documents are uploaded:
Require Check out + No Versioning
Require Check out + Major Versioning
Require Check out + Major and Minor Versioning

b.
Document library configurations resulting in "checked in" status when multiple documents are uploaded:
No Require Checkout + No Versioning
No Require Check out + Major Versioning
No Require Check out + Major and Minor Versioning


2. The document library is configured with a required field. When the document upload completes, the field is not populated and the status for each of the uploaded documents is set to "checked out."