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.
Converting MSG Files Without an Outlook Installation
You do not need Outlook installed just to convert existing MSG files to EML. The important requirement is a converter that can read MSG messages independently and create standard EML files for use in another mail application.
Keep the original MSG archive untouched before conversion.
Select the MSG emails that actually need to be moved.
Load them into an MSG to EML conversion utility and preview the messages.
Choose EML as the output format and save the results separately.
Open a few EML files in Thunderbird or another mail client to verify the content.
For an Outlook free conversion, DataVare MSG to EML Converter Expert can be worth considering as one practical option. It is designed to handle MSG to EML conversion without depending on an installed Outlook application.
Checking a few converted emails first is a sensible way to catch attachment or formatting issues before processing the complete archive.