The easiest way to migrate large PST files to Office 365 is to use a reliable migration method that supports large files, preserves attachments, and maintains the original folder structure. Before starting, create a backup of your PST files, check their integrity, and ensure your Microsoft 365 account has sufficient storage and the required permissions. The Cigati PST to Office 365 Migration Tool offers a convenient option for migrating Outlook PST files to Microsoft 365 mailboxes. It supports bulk PST selection, user mapping, email preview, and date range filtering, helping users manage large migration tasks more efficiently. Its duplicate detection feature can help identify repeated emails, while attachment-handling options provide greater control over transferred files. For very large migrations, process files in manageable batches if needed and monitor the results. After migration, verify important emails, attachments, and folders to confirm successful transfer. Always keep the original PST backups until you have checked the migrated data.
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