I received old MSG files from a backup, but Outlook is not available on my current system. I can see the files, but I cannot open or move them properly. I need to change these MSG emails into EML without setting up Outlook again.
MSG files cannot be opened properly without Outlook because they are Outlook based email files. Thunderbird, Windows Live Mail or Apple Mail will not read them in the same format.
What you should do:
Do not rename msg. to .eml
Keep a backup of the MSG folder
Convert a few files first
heck body text, sender details, date, subject, and attachments
Then convert the complete folder
One offline option I have seen people use is WholeClear MSG to EML Converter Software, mainly because it reads MSG files directly and does not require the installation of Outlook. It supports saving emails in EML format with attachments and message formatting preserved.
Once the sample files open fine in your email client, you can continue with the full folder. Its free trial is helpful for checking real output before using it on all emails.