Outlook mailbox
OSTPST
OST files are tied to an Outlook profile and an Exchange account. A PST is a portable archive you can open, copy or hand to another workstation. Drop the OST, we convert it in an isolated environment, then validate the PST before it is available.
No account on the public uploader. Guest jobs stay within five conversions and 250 MB per day. Business rates start at €0.80/GB for OST → PST.
Describe what you want, then continue to convert.
An OST is a cache. If the mailbox is gone, the profile is broken, or you need a file you can archive independently of Exchange, you need a PST — not another OST.
This page is for that recovery path: one OST in, one validated PST out. It is not a bulk tenant migration; use Densem for Business when you have hundreds of mailboxes.
The worker identifies the file as OST, extracts messages in isolation, assembles a PST, then validates the result before download. A failed validation does not produce a silent half-file.
Encrypted, empty or corrupt OSTs are stopped with a diagnostic instead of a fake success.
Guest tasks are for a single file. Inputs and outputs expire after delivery. Do not treat this as long-term archive storage.
Yes. That is the point of PST: it is a standalone Outlook archive, not a live cache of a mailbox.
No. It rebuilds a local PST from the OST you upload. Server-side recovery is a different problem.
Use the OST to EML guide if you want individual RFC 822 messages rather than an Outlook archive.
