Offline Outlook Data File (.ost)
Updated over a week ago

What is an .ost file?

.ost files are used to store a synchronized copy of your mailbox information on your local computer. When your connection to the mail server is interrupted, for example, when you're on an airplane without WiFi or if your internet connection disconnects, you can still access all emails, calendar data, contacts, and tasks that have been previously downloaded.

You can read and compose messages, create appointments, and add contacts. However, your email messages won't be sent and no new messages will be downloaded until your internet connection is restored.

When the connection is restored, changes are automatically synchronized, and the folders and items on the server and on your computer are identical again.

Converting .ost to .pst

SigParser is unable to process .ost files.

When converting an .ost to .pst file, some data such as email addresses, may be dropped. SigParser will only be able to scan and parse completed .pst files.

You have the option of exporting your Outlook data as a .pst file and importing into SigParser. Instructions can be found HERE.

You can also convert your .ost file to .pst format using the following method:

  1. Run the MS Outlook application and click on the File tab.

  2. Go to the Options, and in the Outlook Options wizard, move your cursor towards the Advanced section.

  3. Here, you need to click on the AutoArchive Settings…

  4. An AutoArchive window pop-up on your screen; enable the required one:

  5. Once you select the necessary option, click on the Ok button.

  6. Finally, your OST file items will be saved into a PST file with assigned archive settings.

If you have any questions, send us an email at support@sigparser.com. You can also book a demo session HERE.

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