Recently, we faced an issue with a client using the Project Site document library. When the users clicked on a document in the Project Document Library and choose “Check Out and Edit” the Users received the below error message:
Issue: This document could not be checked out. You may not have permission to check out the document or it is already checked out or locked for editing by another user
Cause: User unable to check out the document with office word 2007.
Resolution: In this case checking out the document with Office 2010 has resolved the issue, however I need to do further research to see why this was the case – as normally Office 2007 works without causing such issues. Let me know if any of you have had a similar experience