Version 2.1.0.63 is not the latest (as of 2026); newer versions may support more Outlook updates or Office 365 OST variants.
If you only need recent data, click the Filter button. Set a date range (e.g., January 1, 2024 – December 31, 2024). You can also exclude deleted items or junk mail.
We tested Coolutils OST to PST Converter 2.1.0.63 on three different systems: Coolutils OST to PST Converter 2.1.0.63 -x86 x6...
The software used less than 300MB of RAM during all tests and did not crash once. The output PST files were fully intact, and Outlook 2016 imported them without errors. The preview pane worked smoothly even on large folders containing 10,000+ items.
Coolutils offers flexible licensing:
All licenses are lifetime (no subscription), and updates are free for the first year.
| Parameter | Details | |-----------|---------| | File size (installer) | ~30 MB (depends on architecture) | | OS support | Windows 11, 10, 8, 7, Vista, XP (both x86/x64) | | Input format | .ost (Outlook Offline Storage Table) | | Output format | .pst (Outlook Personal Storage Table) | | Outlook requirement | None for conversion | | Encryption support | ANSI, Unicode PST | | Language support | Multilingual | Version 2
Coolutils OST to PST Converter is a Windows utility that converts Microsoft Outlook OST (offline) files into PST (Personal Storage Table) files, allowing users to recover mailbox data from orphaned or inaccessible OST files and import it back into Outlook or other mail clients that accept PST format.