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What is NST File Format ?

Guide to Learn All About What is Office 365 NST & Outlook.nst File

Microsoft Outlook users are aware about the PST as well as OST files. But, they are not familiar with the term ‘NST’, which is also a storage file in MS Outlook 2016, 2013, 2010 & 2007. Therefore, in this blog, we are going to discuss about this .nst file extension of Outlook with its creation, .nst file location, etc. You can also preview data stored within NST File with the help of NST Viewer Tool.

What is Outlook NST File Format

An NST file or .nst file extension is automatically created in Microsoft Outlook 2016, 2013, and all below versions when an individual configures the Office 365 account in Outlook, thereby creating Office 365 .nst file. It is also created when users use an Outlook Connector for IBM Lotus Domino. This file contains all mailboxes like emails, address book, tasks, etc., that a PST or OST file also comprises. The Outlook .nst data file is stored on the local machine where Outlook is configured with an O365 account.

Outlook NST File Extension

How to Create Outlook NST File?

How Outlook NST File Gets Created?

The file gets originated when users have configured their Office 365 account id with Outlook program. Following steps will help one in creating an Office 365 NST file in Outlook 2016 :


Open the Outlook Add account Wizard on your PC and mention the Office 365 email id within it

Outlook Wizard


Outlook starts preparing itself to add a new account to it displaying message "We're Getting Things Ready"

Outlook preparing

A message screen drops down in which you have to Enter the password of your O365 account. Click on OK

Outlook message

A dialog box will appear in which you have to click on OK. This will continue the procedure of creating Office 365 .nst file in Outlook 2016, 2013, 2010 & 2007

Continue Step

When ‘Account setup is complete’ wizard appears, click on OK button

Account setup

The Outlook starts retrieving mailboxes from the configured account. This step might consume huge time because it is totally dependent upon the amount of data saved in the Exchange Online account.

Retrieving messages

When the data gets completely downloaded in Outlook, all things with your configured O365 email id appears. At this stage, you are done with the creation of .nst file extension in Outlook 2016

download completed

Location of Outlook NST File

Outlook NST File Location

The location of NST file format is same as of the OST file path. One can take reference of following steps to learn the Outlook NST file location :


Right click on the Office 365 id configured in Outlook and Select Data File Properties option

Select Data Properties


Click on the Advanced button in the current wizard

Advanced Button

A Microsoft Exchange window appears in which you have to click on Advanced tab >> Outlook Data Settings

Data Settings

Copy the location, which is displayed in File box and then, Click on OK to close the current dialog box. Close all the Outlook screens and Open Windows Explorer

Copy Location

Paste the copied file location on the text box of Windows Explorer and remove last part till ‘Outlook’ word (as per shown in the figure). Press Enter to finally get Outlook NST file location

Path File

Just above the OST file of your O365 account, you will find the required Office 365 .nst file. The NST file format encountered till now will be in healthy state. But, since this file is saved locally on a machine therefore, there are high chances of the corruption. Therefore, in the upcoming section, we are going to discuss solution on how to fix NST file corruption.

NST File Location

How to Recover Corrupt NST File ?

A Reliable Solution to Deal With Corrupt NST Files

The procedure involves renaming of .nst file extension with .ost and then, browsing this file directly in the SysTools Recovery program. This repairing application will be fixing all corruptions from OST & NST file format and will provide several options to save recovered data. Users can take help of following steps to rename Outlook.nst data file with .ost file extension :


If opened then, close all the Outlook related programs and processes. After this, navigate towards the path where corrupted NST file is located

Close Outlook Program


Right-click on this NST file and click on Copy option. When the file gets copied, Paste it somewhere else on the different location of your PC, say desktop

Copy & paste NST File

Again, Right-click on the pasted file and Select Properties option

Select Properties

Change the .nst file extension with .ost and then, click on OK to update the changes

Chnge NST File Extension to OST

Finally, an OST file is created that you can browse within the Tool as mentioned Below :

Run Tool
  • Open SysTools Recovery software on your PC and click on Add File button. Browse .nst (renamed as .ost) file format , which is corrupted
Add File
  • Preview the data of your renamed NST file and then click on Export button
Click Export
  • Select all the recovered NST folders, which are to be saved again after file repairing. Then, choose the file format in which you want your resultant data.
Select File
  • Click on Browse button and choose the folder in which your extracted data files are to be stored. Click on OK when you are done with all this
Destination Location
  • At last, click on Export button to finally recover the data of corrupted NST file
Export File


Now, Outlook is no more limited up to PST and OST files. There is one more storage file within it i.e., NST. Very few technicians are aware from this file format. Hence, here we have described all details about What is Outlook NST File & Office 365 .nst file of Outlook 2016, 2013, 2010 & 2007. Also, we have covered the solution to deal with corrupted NST file Recovery so, that one does not faces any challenge whenever the user has to work with this file.