This usually comes up when MSG files are treated as records and you can’t risk modifying them in any way.
In most cases, the problem happens because people try to open each MSG file in Outlook and manually save attachments, which is slow and also increases the chance of accidental edits or metadata changes if someone drags files around or resaves emails.
A basic manual workaround is to copy the MSG archive to another folder first and then extract attachments using Outlook or a script. This keeps the original set untouched, but honestly it doesn’t scale well when you’re dealing with hundreds or thousands of files.
For bulk extraction, I’ve seen people use tools like Softaken MSG Attachment Extractor where you point it to a duplicate folder. It reads the MSG files in read-only mode and pulls out attachments without altering the source emails. The key is always working on a copied dataset so the original archive stays exactly as it is.
One thing I’d suggest is to always verify a small sample first before running a full batch, just to be sure the output structure matches what your ops team expects.
