Are you suffering from the error Outlook is using an old copy of your Outlook data file ? Then it just because of OST file becomes corrupt. This type of error can be arise due to some problem with an Outlook email client.
Therefore through this guide we will give you free methods that will help you to fix Outlook can not open OST issue. But before moving forward lets know the reasons behind the creation of this Outlook is using an old copy of your OST error.
- Sudden shutdown of the system or outage in the power supply
- Improper functioning of the Windows OS or Outlook application
- Due to a Virus attack
- An internal issue in the software or hardware
Methods to Resolve Issue “Outlook is using an old copy of your Outlook data file”
Follow the below steps to fix OST file error. Below we covered both the manual and automated method that will help you to fix this issue.
Step 1. Deleting the OST file
- Visit my computer section
- Navigate to C:\Users\<your login name>\AppData\Local\Microsoft\Outlook
- Then you need to delete the file having the .ost extension
- Make sure to don’t delete file having .pst extension
Step 2. Restart the Outlook
- Visit the control panel > open the mail items
- Tap on show profiles > choose your profile and tap on properties
- Select the email accounts
- Choose the view option or change existing e-mail accounts and tap next
- Here you need to visit Microsoft Exchange Server Account and click change
- The next window will appear with options Mailbox server and Username and tap on more settings
- Now tap on the security option
- Then choose the Encrypt data between Microsoft Office Outlook and Microsoft Exchange Server option and tap ok
After following the above steps the error Outlook is using an old copy of your Outlook data file gets resolved.
Automated Solution to fix Outlook is using an old copy of your OST
Here we will fix the issue with the help of SysInspire OST to PST Converter software which is totally virus free tool.
Working of SysInspire OST to PST Converter
- Start the SysInspire OST to PST Converter software on your system
- Tap on the select OST button to make the selection of Corrupt OST file

- The software scans the file and fix all its Outlook errors and make it usable for the users

- In the next window select PST format and tap convert for the successful OST to PST Conversion.

Final words
Here in this blog post, we mentioned both automated and manual solutions in depth. If you unable to fix Outlook error with manual approach then it better to go with SysInspire OST to PST Converter software. This tool allows the users to fix the “Outlook is using an old copy of your Outlook data file” error without any data moderation.
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