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How to Fix Outlook.ost is Not an Offline Folder File Error – Solved It Quickly

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Published By Deepa Pandey
Ashwani Tiwari
Approved By Ashwani Tiwari
Published On December 28th, 2023
Reading Time 3 Minutes Reading
Category MS Outlook

Introduction: – We know that Outlook OST file stands for Offline Storage Table. But in some situations Outlook shows “Outlook.ost is not an offline folder file error”. So in this post we will explain the reason behind this error and provide the solution to fix ost is not an outlook data file error.

Outlook is an email client that enables the user to send and receive emails, attachments, notes, to-do, etc. through the network. It stores the entire data either in .ost or .pst file format. When Outlook is connected to Microsoft Exchange Server then it stores all data in .ost file format otherwise in .pst file format.

The OST file can be accessed without an internet connection means while offline. But there are some reasons that restrict the user to access the .ost file and prompt an error message i.e. Outlook.ost is not an offline folder file. This error can be fixed by performing some simple steps, which are given below:

Quick Guide:

Using Outlook as your default mail client is good. But in some situations, Outlook creates some problems while accessing it. It is advised to have a trusted and expert suggested utility OST Recovery Software.

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Reasons Behind Outlook OST is not an Offline File Error

There are mainly two reasons behind ost is not an outlook data file 2016 error and both are mentioned below:

  1. The OST file gets damaged and Microsoft Outlook is unable to identify it.

  2. The Exchange Server is unable to access the particular mailbox and showing ost is not an offline folder error.

The Solution to Fix Outlook. ost is Not an Offline Folder File Error

This ost file error can be fixed easily, just follow the instruction mentioned below and in the end, you will be able to access the entire data from Outlook OST file.

  1. Find OST File on Host System: – First of all find the damaged ost file from your system. You need to just read the ost is not an outlook data file error error message carefully. It contains the file name. You can also use the Windows search feature to find the .ost file.

  2. Backup OST Before Fixing Error: – It is recommended that after finding the damaged .ost file first take an updated backup and then proceed to fix this error.

  3. Delete and Recreate Damaged OST File: – After a successful backup of Outlook OST file simply delete and recreate Exchange Server OST file. But, keep one thing in mind you will lose all data which is updated offline. Here find the complete guide on how to delete and recreate Outlook OST files.

  4. Access the OST File Using Outlook: – After fixing Outlook.ost is not an offline folder file error. Access all your important data in any version of Microsoft Outlook-like 2021, 2019, 2016, 2013, 2010, 2007, 2003, etc.

Also Read: – If your Outlook data file got corrupted, then try trusted solution to Repair OST File for IMAP Outlook. Also, for POP Outlook, Repair Corrupt PST file.

Final Words

In conclusion, Now it’s become quite easy to fix Outlook.ost file is not an offline folder file error. Simply follow the steps mentioned in this article and fix the most encountered ost is not an outlook data file error.