Using a professional tool like
SysInfo OST to PST Converter is one of the easiest and safest ways to convert OST files into PST format. It ensures 100% data accuracy, maintains your original folder structure, and supports emails, contacts, calendars, tasks, and more. You can
convert single or multiple OST files, remove duplicates, filter emails by date, and even split large PST files if needed. It also supports conversion to various file formats and lets you import data directly to cloud platforms like Office 365, Gmail, or Yahoo Mail.