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Thunderbird Unable to Open the Summary File for Inbox [Solved]

Admin | July 15th, 2020 | Thunderbird

Summary: This blog describes why Thunderbird unable to open the summary file for inbox. This error may cause the application to slow down, stop the application working properly, freeze the application, or shut down. This blog also provides solution for troubleshooting Thunderbird issues.

What is Mozilla Thunderbird MSF File?

Mozilla Thunderbird basically tends to store email data in two parts. The first is an MBOX file (without extension). This is actually Thunderbird’s standard format for storing email data. The second is an MSF file (.MSF extension), also known as a “Mail Summary File”.

This is a Thunderbird index file that basically contains only the header and the email summary. All other sub-containers are stored, such as drafts, mails, junk, important items, etc. In the .sbd directory. It has a pair of containers like Inbox.msf and Inbox, Sent.msf and Sent, and so on.

Why Thunderbird Unable to Open the Summary File for Inbox?

Despite its many benefits, you may have problems or errors with Mozilla Thunderbird applications that require timely troubleshooting. One of the common problems is email header corruption which leads unable to open summary file error.

When email header is corrupted you also face unable to open Thunderbird emails error. The manual solution (Repair Thunderbird Folder) is available to solve Thunderbird unable to open the summary file for inbox error.

Manually Fix Mozilla Thunderbird Mailbox Folder Issue

Thunderbird provides inbuild Repair Folder option to solve mailbox folder issues. Follow the steps to solve Thunderbird unable to open the summary file for inbox:

1. Right Click on Thunderbird Mailbox Folder (Inbox, Drafts, Sent, etc.)
Right Click on Inbox Folder

2. Then Click on Properties Option from Drop Down
 Click on Properties Option

3. Next, Click on General Information >> Repair Folder >> OK.
Repair Folder to Fix Thunderbird unable to open the summary file for inbox

This inbuild repairing option can fix minor corruption in the Thunderbird mailbox folder.

Free Solution to Fix Thunderbird Unable to Open Mailbox File

Free MBOX Viewer Software helps to open and read the Thunderbird mailbox file (MBOX) with header information from the MSF file. Preview emails in multiple view options such as Properties View, Message Header View, MIME View, Hex View, etc.

Download Now    Upgrade Now

Upgrade to MBOX Viewer Pro version for advanced Search and Export options.

The Bottom Line

Best and inbuild manual solution to solve Thunderbird unable to open the summary file for inbox error. Also, we suggested the free solution to open Thunderfird mailbox file with header information.