He paid the $49 via PayPal, holding his breath. The full version exported the entire 45GB archive into a pristine .pst file in under two hours.
Arjun smiled. He closed his laptop. For the first time in three days, he didn't care about the haters. His mbox had found its home.
"Update for anyone searching this in 2025: I used SysTools inside a Windows Sandbox based on u/Retired_IT_Guy's advice. Paid $49. 45GB converted clean. Attachments are intact. No viruses. Just read the comments first and don't be an idiot with free exe files. Case closed." mbox to pst converter reddit
Arjun clicked the folder. There they were. Subject lines, attachments, even the read receipts.
That evening, Arjun returned to Reddit. He found the original thread for and posted his own reply: He paid the $49 via PayPal, holding his breath
When his company switched to Microsoft 365, the IT director, Cheryl, gave him a mandate: "Get those old emails into Outlook PST by Friday, or we lose the legal discovery chain."
"Where are the emails from Q3 2011?" she asked. He closed his laptop
At 9:00 AM, Arjun walked into Cheryl’s office. He plugged in an external SSD, dragged the new archive.pst into the network drive, and watched her mount it in Outlook.
The Great Migration of '23
Arjun followed the advice to the letter. He turned on Windows Sandbox—a clean, isolated Windows environment. He downloaded the trial of SysTools Mbox to PST Converter inside the sandbox.
Arjun tried the obvious first. He renamed the file to .pst . Nothing. He tried dragging the .mbox file into Outlook 2019. Outlook crashed so hard it gave him the Blue Screen of Death. Panic set in.