To manually Import PST file into Horde Mail Server, you need to first convert the PST file into a compatible format, such as MBOX or EML, since Horde does not support direct PST imports. This process requires using a third-party tool to convert the PST file. Once converted, you can upload the files via Hordes import feature. However, this manual process is time-consuming, requires technical knowledge, and can lead to data loss if not done carefully.

Alternatively, using Cigati PST Converter Tool simplifies the process. This tool allows direct conversion of PST files to formats like MBOX or EML, which are easily imported into the Horde Mail Server. It preserves email data integrity, including attachments, and ensures the entire process is completed without hassle. The software's user-friendly interface makes it a faster and more reliable option compared to manual conversion methods.