If you are looking for a reliable way to convert OST to PST when your Outlook profile is not working, you can take the help of a useful tool like GainTools OST to PST Converter Software. This tool easily converts inaccessible or orphaned OST files into PST format without data loss. It supports the conversion of complete mailbox data, including emails, contacts, calendars, attachments, and all mailbox folders. It maintains the 100% original email formatting and structure, ensuring there is no worry about losing any data. This easy-to-use application makes the whole conversion process effortless for you, whether you have technical skills or not. Additionally, the software is designed to work on all versions of Windows OS, such as the latest and oldest versions.

I’ve faced the same issue; manually converting multiple ICS files is messy and risks losing recurring events or details. From my experience, SysTools ICS Converter is a solid choice for bulk conversion.

Why does it work well?

List item supports batch processing, add multiple ICS files or an entire folder at once.
Converts to PST, CSV, iCal/ICS, and other formats.
Preserves event details, including descriptions, attendees, and recurring events.
Can handle large ICS batches without errors.

Tips:
Always back up your original ICS files before conversion.
After conversion, spot-check a few events to ensure recurring events and reminders are intact.
If using CSV, check that all columns (start/end, description, attendees, etc.) are correct.
Overall, it’s a reliable way to quickly convert multiple ICS files without data loss, saving a ton of time compared to manual methods.

You can split a large ICS file by exporting each event into its own ICS, and the easiest way is using SysTools ICS Splitter. It automatically breaks massive ICS files into smaller, event-based or date-based files while preserving all metadata, attachments, and formatting. The tool supports bulk processing, keeps the original folder structure intact, and avoids corruption issues common with manual methods. If you need clean, organized, shareable ICS files without hassle, this utility is a reliable, time-saving option.

Do you want to Import EML to G Suite Account? Then try WholeClear EML to G Suite Converter. It has a simple and user-friendly interface. It imports Bulk EML files at once without data loss. It ensures secure and Batch migration. Provide complete conversion of EML files and attachments. Keep the folder and original structure. Not required additional tools. It supports all Windows OS versions, including 11,10,8, and others. The application provides 24*7 technical help.