MS Outlook was formerly known as Hotmail and an OST file is generated by the Hotmail accounts as well as Outlook but this file name is Hotmail.ost. For this Hotmail.ost file, an additional plug-in Microsoft Outlook Hotmail Connector is required. Sometimes, users face an error message “Hotmail.ost is not an Outlook data file” despite having the Hotmail connector. So, let’s discuss a user’s problem to understand this error in a better way.
Some days ago, I had deleted my Outlook account. Now, I have reinstalled the Outlook email client. But, when I tried to send an email then got an error message that Hotmail.ost is not an Outlook data file. Can anyone please tell me why outlook comes up with this error message” 
Does the above-mentioned query seem similar to you? Are you also looking for the solution to resolve the Outlook data file error? If yes, then don’t be get panic, because we are here to fix your OST file issues. In this write-up, we will give you the perfect solution by which you can easily fix the Hotmail.ost is not an Outlook data file error. Before going towards the solution, let us discuss the reasons behind the error. 
Some Possible Reasons Behind This Outlook Error  
There are following situations where a user receives this error message: “Hotmail.ost is not an Outlook data file”: 
a). Running an older version of Hotmail connector 
b). When a user deletes his Outlook profile 
c). MS Outlook is running in compatible mode 
d). Microsoft Outlook has been uninstalled 
e). Problem with the Hotmail connector 
f). If corruption occurs in the OST file 
How to Resolve Hotmail.ost is not an outlook data file Error 

In order to resolve this Outlook error, there are following solutions available which can easily rectify the error regarding Hotmail and Outlook & resolve them. 

Solution 1: Re-install the Microsoft Outlook Hotmail Connector 


This solution is specific to removing errors. Once the Microsoft Outlook Hotmail Connector is removed, then this error will be removed as well. To reinstall the Hotmail connector, perform these steps: 
  1. First of all, delete the Hotmail profile configured on Outlook 
  2. Then, uninstall the Microsoft Outlook Hotmail Connector 
  3. After that, close the Outlook program 
  4. Now, delete the OST file that was creating problems 
  5. Further, reinstall the latest version of Microsoft Outlook Hotmail Connector
Finally, configure the Outlook again with a new profile. Then, a new OST will be created that will not create errors anymore. 
This is a proven solution and it worked for many users. However, in any case, this solution may not be able to resolve some issues of Hotmail.ost files, then you can move towards the next solution and try to resolve the Hotmail.ost is not an Outlook data file issue. 

Solution 2: Check If Outlook is in Compatibility Mode 


Sometimes, MS Outlook may be running in compatibility mode. This may also create an error like ‘Hotmail OST is not an offline folder’. In order to fix this issue these steps should be followed: 
1. At first, Go to C: >> Program files >> Microsoft Office >> Office14 
2. Then, find the Outlook.exe file & Right-click on it 
3. Now, click on the Properties & go to the Compatibility Tab
4. Finally, uncheck the compatibility mode box & click on OK button
This is one of the solutions which is provided by the Microsoft experts. Still, if this method does not resolve your Hotmail.ost file issue, then you can move to the next step. 

Solution 3: Alternative Method to Fix Hotmail.ost is not an Outlook data file Error

If the above discussed both manual methods do not help you, then you can try the most effective solution like OST to PST Converter tool. By using this reliable method you can fix the ‘Hotmail OST is not an offline folder error. This is completely free of cost solution which is provided for Outlook users who is facing issue with Hotmail.ost is not an Outlook data file. Moreover, it is a reliable and efficient solution to resolve the Outlook data file error.

Time to Wrap Up 
Hotmail is a free email service that can arise issue “Hotmail.ost is not an Outlook data file” while configuring on Outlook program. This error can be rectified by these three given solutions in this post. If nothing else works, then users can choose to the last commercial method. It is a powerful solution that works even on the orphaned file. Using this utility, a user can preview his mailbox contents.
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Diptesh Kumar Bhakat is proud to be the author of fastest growing tech blogs. He is a tech-savvy, SEO Expert, SMO Expert, SMM Specialist and a professional Blogger. Except blogging, he is so much found in photography, superbike riding. He has a very close attachment to the tech world and loves to blog on his fav topics. He has also contributed to many regional dailies and authored guest posts on some of the leading tech blogs. Professionally, he is a tech blogger and reviewer. he is a very energetic person who constantly puts up an evil smile to counter any obstacle in his manner. This dude is highly unpredictable and in reality, you can’t recognize what’s coming from him…be it his articles, generating an aura, or his personality. Mr. Diptesh is completed his B.Tech in Mechanical Engineering, as everybody thinks about one question that how a mechanical engineer can make a website?? Is it strange!!!!!!!! Yes it is. But there is a big story we will update soon.

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