GainTools MBOX to PST Converter Case Study: Moving 850,000 Recruitment Emails from Thunderbird to Outlook Successfully

HR Consulting Company Moves Thunderbird Recruitment Email Archives to Outlook

Over the course of nine years, a top HR consulting company that specializes in executive recruiting and recruitment had amassed 850,000 recruitment emails in Mozilla Thunderbird. The company used Thunderbird's MBOX mailboxes to handle applicant applications, interview schedules, offer letters, customer correspondence, and compliance records.

The IT team had to migrate years' worth of old recruitment emails without losing attachments, folder hierarchy, timestamps, or information after implementing Microsoft Outlook in every department. Maintaining mailbox integrity was crucial since recruiters frequently looked through previous communications during the employment process.

Statistics for Organizations

• 850,000 emails in total
• 312 MBOX files in total
• 486 GB is the total mailbox size.
• 11.8 GB is the largest mailbox.
• Deadline for Migration: Five Days
• Thunderbird Email Client
• Destination: Outlook 2021 from Microsoft

Meaning and Importance

MBOX

Thunderbird, Apple Mail, Eudora, SeaMonkey, and a number of other email programs use the MBOX mailbox file type. It preserves folders and message attributes while storing several email messages in a single file.

PST

Outlook uses Microsoft's mailbox format, PST (Personal Storage Table), to store emails, contacts, calendars, notes, tasks, and attachments locally.

Significance of MBOX to PST Conversion

Outlook's inability to read Thunderbird MBOX archives directly made the transfer necessary. Recruiters were able to preserve legal compliance, access prior hiring information, and continue working inside Outlook without having to recreate old mailboxes by converting mailboxes into PST.

Migration Methods Evaluated

Manual Approach

In order to test a manual migration, the IT department first synchronized folders, imported emails into Outlook, and configured Thunderbird and Outlook using an intermediary email account.

Manual Results

The team noted the following after testing 15 mailboxes (22 GB):

• It took about eighteen hours to migrate.
• A number of folder names were automatically modified.
• Approximately 430 attachments needed to be manually verified.
• There were synchronization delays for several recruiters.
• As mailboxes got bigger, the process got slower.

Restrictions and Difficulties

• Every workstation must have Outlook and Thunderbird configured. It takes a lot of time for hundreds of mailboxes. Maintaining the folder hierarchy is challenging.
• A higher likelihood of missing emails
• A lot of administrative work
• Inappropriate for 486 GB bulk migration

Tool-Based Approach

The company moved to GainTools MBOX to PST Converter, which enables batch processing of all Thunderbird mailboxes into PST files that are compatible with Outlook. The program allows for the creation of one or more PST files, facilitates mass conversion, and maintains email attributes.

Tool-Based Result

Final report on migration:

• 100% Healthy Mailboxes with Successful Conversion
• No Missing Emails
• 100 % Folder Accuracy
• Complete Preservation of Attachments

The next morning, recruiters went back to work without having to reconstruct their archives.

Manual Vs. Tool-Based Solution

How the Organization Benefited from the Tool.

Batch Conversion: The total migration time was greatly decreased by converting several MBOX files at once.

Preservation of Folder Hierarchy: Recruitment folders were kept in the same order as they were in Thunderbird.

Attachment Integrity: Each interview paper, offer letter and CV was still connected to its original email.

Preservation of Metadata: Email attributes, subject lines, timestamps, sender information and recipients did not change.

Support for Large Mailboxes: Mailboxes larger than 10 GB were successfully and continuously processed by the program.

Selective Conversion: Prior to processing all mailboxes, the IT team converted only active recruitment archives during pilot testing.

Easy-to-Use Interface: Even junior administrators could handle the migration because it just needed a few guided steps.

Compatibility with Outlook: The generated PST files were successfully opened in Windows Outlook versions that were compatible.

Limitations and Difficulties of Tool-Based Methods

Windows-Only Program: Mac users need a Windows environment because the software runs on Windows systems.

Required Healthy MBOX Files: MBOX files that are corrupted or unreadable must be fixed before being converted.

Limitations of the Trial Version: Before buying a license, the free trial can only convert a certain number of emails per folder.

The Tool-Based Method's Steps

1. Install the application after downloading it.
2. Start the program.
3. Select either Folder Mode or File Mode.
4. Look through and open MBOX files in Thunderbird.
5. View the mailbox data that has been attached.
6. Choose the necessary folders.
7. Select PST as the export format.
8. Decide whether to make several PST files, a new PST or an existing PST.
9. Select the folder that will be used.
10. Select "Convert Now."
11. Launch Outlook and open the created PST file.

Software Pricing

As stated on the official website:

• Free Trial: Users can test the program before making a purchase by converting a small number of emails from each MBOX folder.
• Personal License: $29 (USD) One-time payment for lifetime use.
• Business License: $99 (USD) One-time payment for lifetime use.
• Enterprise License: $299 (USD) One-time payment for lifetime use.

Note: Over time, licensing and pricing may change. Before making a purchase, always check the official website for the most recent plans.

Best Practices

Advice for a Safer Migration Process

• Make a backup of the original MBOX files.
• Before converting, check the mailbox's health.
• Use a local drive to store output PST files.
• Before moving all mail, test a small batch.
• Verify compatibility with Outlook following conversion.
• Verify multiple directories before removing Thunderbird archives.

Things to Keep in Mind

• Make sure there is enough free disk space.
• When converting, close Outlook.
• Do not interfere with the migration process.
• Prevent antivirus software from preventing access to files while they are being converted.

Specific Audience

This is the best option for:

• HR consulting companies that manage hiring records
• Administrators of corporate IT
• Hiring firms switching to Outlook
• Email history is preserved by the legal and regulatory departments.
• Small and medium-sized companies leaving Thunderbird

Faster migration, mailbox structure preservation and less administrative effort while keeping full recruitment data are all advantages for these users.

FAQs

Why did the HR department switch from Thunderbird to Outlook?

The company required unified Outlook access for all recruiters and standardized its email platform.

During this case study, how many emails were moved?

The conversion rate of recruitment emails was about 850,000.

After migration, were attachments kept intact?

Yes. Every CV, interview transcript and other attachment was undamaged.

What was the duration of the last migration?

It took about eight hours and twelve minutes to accomplish the entire migration.

Did the company lose any emails?

No, the migration of all healthy mailbox data was accomplished.

For this project, was the manual migration feasible?

No, it was too slow and challenging for hundreds of big mailboxes.

Conclusion

Large-scale Thunderbird-to-Outlook migrations can be made easier with a specialized conversion solution, as this case study shows. The company successfully moved 312 MBOX files, 486 GB of mailbox data and 850,000 recruitment emails while maintaining folders, attachments and metadata. The automated method produced consistent results for healthy mailbox files while cutting down on administrative work and migration time when compared to the human method.

Businesses, HR departments, IT administrators and organizations preparing large-scale email migrations from Thunderbird to Outlook are the greatest candidates for this solution. Its batch processing, mailbox preservation and user-friendliness surpass these drawbacks, even if it is restricted to Windows systems and requires healthy MBOX files.