You can do it in both ways, either manually or with the help of an automated tool. The manual method is time-consuming, Risk of data loss or incomplete transfer, requires constant internet access for syncing, and cannot directly export to PST — you have to manually move synced emails. On the other hand with the help of a professional tool like Migrate Cloud Data OLM to PST Conveter, which offers fast and efficient for large OLM files, Preserves email formatting, folder hierarchy, metadata, and attachments, supports bulk conversion of multiple OLM files at once, easy-to-use interface (no technical expertise required), can export directly to other formats or email platforms (in most tools)