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Auto Email Backup

C# .NET Outlook Interop File I/O

A robust console utility built to secure personal and corporate communications. It interfaces directly with Microsoft Outlook (MAPI) to recursively extract emails, mirror folder structures locally, and save messages as standard `.msg` files for offline archiving.

Technical Features

Structure Mirroring

The tool recursively iterates through the entire Outlook directory tree. If you have a nested folder structure in Outlook (e.g., `Inbox > Projects > 2026`), the software automatically creates the identical folder path on your local drive to keep archives organized.

Incremental Backup

Designed for efficiency. Before saving an email, the system checks if the file already exists and compares the `LastModificationTime`. This ensures that only new or modified emails are downloaded, significantly reducing backup time for large inboxes.

Native .MSG Export

Emails are saved in the standard Microsoft Outlook `.msg` format (`olMSGUnicode`). This preserves all metadata, attachments, and formatting, ensuring the backup files can be opened natively in Outlook on any other machine.

Console UI

Utilizes `ShellProgressBar` to provide real-time feedback. Users see exactly which folder is being processed and the percentage of completion, ensuring the application is responsive during long operations.