How to Fix “OST File Cannot Be Opened” Error

[anjaliaggarwal]

If you're getting the “OST file cannot be opened” error in Microsoft Outlook, it usually means the file is corrupted, inaccessible, or there’s a profile/sync issue. If it is a minor error, then the manual fixes will help. However, with a highly corrupted OST file you need a recovery software. In that case, you can try the BLR OSR Recovery Tool for secure and instant repair.

Here are some quick fixes that work:


1. Restart Outlook & Check Connection: Close Outlook, restart your system, and make sure your internet connection is stable.

2. Recreate the OST File : Since OST is a cached file:


Close Outlook
Go to the OST file location
Delete the OST file
Reopen Outlook to rebuild it automatically



3. Create a New Outlook Profile


Go to Control Panel → Mail → Show Profiles
Create a new profile and set it as the default



4. Disable Add-ins: Open Outlook in Safe Mode (Outlook.exe /safe) and disable unnecessary add-ins.

5. Check Mailbox Server Status: Ensure your Exchange/IMAP account is active and syncing properly.

6. Convert OST to PST (If File is Inaccessible): If the OST file is orphaned or severely corrupted, converting it to PST helps recover your data.

Conclusion:
Recreating the OST file usually fixes the issue quickly. If that doesnÂ’t work, creating a new profile or converting OST to PST is the most reliable solution.

[alxenderjhony]

To fix an OST file cannot be opened error in Outlook involves repairing the file, recreating the OST file, and fixing the Outlook profile.

Method 1: Recreate the OST file

Open Control Panel > Mail > Data Files.
Click Open File Location.
Close Outlook, then delete the .ost file from that folder.
Restart Outlook

Method 2: Create a new Outlook profile

Go to Control Panel > Mail > Show Profiles.
Click Add to create a new profile.
Set the new profile as the default and restart Outlook.

Method 3: Convert OST to PST
If the OST files are orphaned or no longer exist on the server, you need to convert the OST file into PST to again access the data in Outlook. To convert an OST file, you can utilise a dedicated tool like Softaken OST to PST Converter. With the use of this utility, you can easily convert any size of OST files without installing Outlook. Moreover, these techniques are simple and easy that both tech and non-tech users can efficiently use.
Read More: https://www.softaken.com/guide/outlook-ost-file-cannot-be-opened-in-windows-10/