Download and install the latest version of Filestar.
Right click on one or more Ost file(s) on your desktop and select Convert with Filestar.
Type convert to eml in the search box.
Press Convert.
Or let an AI agent do it: filestarcli -i file.ost -c "convert to eml" (how).
Documents - File Explorer─☐✕
This PC › Documents
Home
Desktop
Downloads
Documents
Pictures
Music
.ostContract.ost
.xlsxBudget.xlsx
.pdfReport.pdf
.pngLogo.png
Filestar*Help✕
Drop files here to get started
ConvertMergeCompressExtractMoveZip
Let your AI agent convert OST to EML
Claude Code, Codex, Cursor and other agents can do this on your computer with Filestar. Your files stay on your machine.
Install Filestar and add it to your agents:
npm install -g filestar
filestarcli agent install
Then ask your agent:
“Convert the OST files in my Downloads folder to EML”
Or run it yourself:
filestarcli -i file.ost -c "convert to eml"
Runs on your computer, so your files stay on it. Works on Windows, macOS and Linux. 50 free conversions with the npm install, no account needed.
Can my AI agent convert OST to EML?
Yes. Install the Filestar CLI with npm install -g filestar and your agent can run filestarcli -i file.ost -c "convert to eml" on your computer, so your files stay on it.
n OST file is a data file created by Microsoft Outlook (2005 or later), an email client and personal information manager. It is used to store a copy of mailbox information from an Office 365, Exchange, or Outlook.com account. OST files may contain email messages, contacts, tasks, calendar data, and other account information.
An EML file is an email message saved by an email program, such as Microsoft Outlook or Apple Mail. It contains the content of the message, along with the subject, sender, recipient(s), and date of the message. EML files may also store one or more email attachments, which are files sent with the message.
