Why “Outlook is using an Old Copy of your Outlook Data File (.ost)” Error Occurs?
- The improper synchronization process between OST and Exchange server
- Corruption in OST file
- Virus and malware infection
- Inappropriate up-gradation of Outlook application
- Abrupt termination of system
- Hardware or software issues
Deletion of Old OST Files
You can resolve this error by deleting the old offline storage table or OST files.
To delete the Outlook OST, first, you have unhide the OST file as the Outlook OST file is a hidden file. After making the files unhide, you’re able to view the hidden files. Now, perform the given steps:
1: Go to the Computer or File Explorer Window.
2: Navigate to C:\Users\User Folder\AppData\Local\Microsoft\Outlook.
3: Now, delete the files with the .ost extension.
4: Make sure that you have not deleted any file with the .pst extension.
5: Restart your MS Outlook application.