The NSF conversion error file not recognized as a valid Notes database happens a lot when the NSF file is broken, damaged, or missing. This can happen if the system crashes suddenly, if you don't shut down IBM Notes properly, if a virus hits, or if there are problems during file transfer. When the file is broken, Notes can't read it well, and normal ways to convert it don't work.
In this case you can do the following
Restore from Backup - Make sure you have a recent backup of the NSF file or the IBM Notes mailbox. The safest approach to get your data back is to restore the backup.
Use the built in recovery tools in IBM Notes - Sometimes the Fixup, Compact and Updall tools in IBM Notes can fix corrupted NSF files. To prevent making things worse, run these instructions carefully on a copy of your NSF file.
After that for NSF conversion You can use DataVare NSF Converter. It is made to work with NSF files. You can use this software to convert NSF mailboxes into Outlook PST, EML, MSG, or other formats. It makes sure that all emails, contacts, calendars, and attachments are kept.
This approach works well, is easy to use, and is safe for NSF files.
In this case you can do the following
Restore from Backup - Make sure you have a recent backup of the NSF file or the IBM Notes mailbox. The safest approach to get your data back is to restore the backup.
Use the built in recovery tools in IBM Notes - Sometimes the Fixup, Compact and Updall tools in IBM Notes can fix corrupted NSF files. To prevent making things worse, run these instructions carefully on a copy of your NSF file.
After that for NSF conversion You can use DataVare NSF Converter. It is made to work with NSF files. You can use this software to convert NSF mailboxes into Outlook PST, EML, MSG, or other formats. It makes sure that all emails, contacts, calendars, and attachments are kept.
This approach works well, is easy to use, and is safe for NSF files.