How to Open OST File in Outlook 2019 – Amazingly Simple Answer to a Seemingly Hard Question!
MS Outlook 2019
Outlook 2019 and previous versions have a rather seemingly complex file type with a very simple use. It’s called OST, short for Offline Storage Table. This is an offline folder file that conveniently allows you to access your emails offline and even make changes and then sync them up with the server later when there is internet. It’s very similar to the cached mode.
When you rebuild your profile, Outlook creates a new OST file and downloads your server data again to the new OST file.
Problem With OST file
But every once in a while, we get questions from our readers, like this one:
“My hard Disk got corrupt, which stored my Outlook 2019 data. When I got everything back and running, I couldn’t find my old content in Outlook 2019 folders. That’s when I started digging around and found files with *.OST inside the profile database directory. There’s another OST file associated with the account but was created when I re-added my email account. So, I suspect (hope?) the old OST file has my old data. But the only problem is that I don’t know how to use it or how to open that OST file in Outlook 2019?”
This is a very common category of problems we get asked. It usually goes like this: there’s a file in my computer with a strange extension and I don’t know which application or program can open it.
In most cases, you can Google it and find out. But in the case of *.OST extension, all you will get is that it is an Outlook file where emails are stored and is intended to be for offline use in Outlook.
Do not worry if you are in that camp.
OST file is intended just for the Outlook internal functions and automatically works with the server and offline database. But if you do need to get the data back (like in the case of our email above), you can use that OST file.
But it cannot be opened directly. Opening OST file in Outlook 2019 is not technically possible, but what you can do is convert it to PST.
It’s as simple as that.
PST for MS Outlook 2019
PST is another data file with Outlook and is pretty much similar to Outlook, except it is “personal” and you can import it to Outlook 2019 and other versions. It’s the most native and original file for the email client and has been in use for various purposes like backup, archives, migration, and more.
How to Open OST File in Outlook 2019
We recommend “OST Extractor Pro” to convert your OST file to PST. It’s as simple a tool as you can find but without any limitations or lacking in features. You can use it in either scenario: large-scale data recovery or on your home computer with a decent size database. The tool works with every little data element in your files and processes them into PST without loss in details.

On a related note, “OST Extractor Pro” is actually a far more advanced and versatile software application than a simple OST to PST converter. You can convert the data in OST to many other formats including Apple Mail, Thunderbird, MBOX, EML, and more.
Get it to Open OST File in Outlook 2019
If you want to get close to its way of working, specifically to your files, download the trial setup file and check it out.

To open ost file in Outlook 2019 for Mac or Windows, get ‘OST Extractor Pro‘ today.