Technique to Resolve Outlook OST File is Not an Offline Folder

When Microsoft Outlook is used in conjunction of Exchange Server and Cache Exchange mode of Outlook is enable , it creates an implicit offline folder that allows us to work even in downtime of Exchange Server. The Outlook OST Offline folder is replica of Exchange server mailbox's data. But it has been seen that while using Microsoft Outlook and try to access OST file, MS outlook produces an error message "Cannot open your default email folders. The Outlook OST file is not an offline folder". Read this blog to learn more about what's the reason behind this error and appropriate solution for this error.

What's the reason behind this error ?

The main reason behind - Outlook OST file is not an offline folder error messages are listed below.

• OST file is damaged or majorly corrupted
• Deletion of Mail account for Exchange mailbox in Outlook
• If OST file is not able to establish synchronization with Mailboxes of Exchange Server
• If you have deleted or disabled your Exchange Mailbox account

How to get rid from this type of error " Outlook OST file is not an offline folder "

1. Close Microsoft Outlook application properly

2. Find the location of OST file that causes error

3. Rename or delete the original OST file that causes the problem.

If your MS outlook able to connect with exchange sever correctly then start outlook and send/receive your emails on exchange mailbox, which will create a new OST file automatically thereafter it will synchronize its data with exchange mail box.

There might your OST file is corrupted and you need to repair it. You can also run inbox repair tool to fix different corruption issues of OST file.

Using above procedure, you will fix this error Cannot open your default email folders. The Outlook OST file is not an offline folder ". But if you are not able to fix your issues then it is recommended to use highly reliable Exchange OST Recovery program.