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How to Split and Merge MBOX email files?


Download SysInspire MBOX Splitter and Merger software, for splitting and merging MBOX files. Split MBOX files into multiple small parts and merge two or more MBOX files into a single file. With a number of methods split and merge MBOX files multiple MBOX file at a single time. Complete the MBOX file merging and splitting job without facing any data loss issues.

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Try free demo edition to split and merge MBOX files with 20 emails from each folder for free.

Step-1) Download & Launch SysInspire MBOX Split & Merge software on a windows-based PC and press the "Add File/Folder" button
MBOX Merge and Split software main screen
Step-2) Select an MBOX file adding mode from the available options: -
  • Select MBOX file: - Add one MBOX file at one time
  • Select MBOX Folder: - Add a folder having multiple MBOX files.
  • Auto Load Thunderbird Profile: - load all Thunderbird profile mail folders in a single click.

Choose your desired option of importing MBOX files, add all MBOX files and hit the Next button

IMAP Migration tool main screen
Step-3) Load mail folders from added MBOX files, preview emails, and choose needed folders.
IMAP Migration tool main screen

Select required MBOX mail folders, and apply the below mentioned steps for splitting and Merging MBOX files.

Split MBOX file to separate files
Step-4) Press the Split/Merge button and from the next screen choose the Select MBOX file option and hit on Next.
save imap emails to local drive
Step-5) From the splitting options, select the Split by size method and apply these settings: -
  • Input Size: - Enter the in which you want to split MBOX and get new MBOX files.
  • Filter Mail: - Choose start and end dates of email and Split MBOX file with emails of selected dates.

Press the Next button.

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Step-5) Choose the Split by date option, for splitting MBOX files with emails of specific dates.
  • Date filter: - Select date in "From" and "TO" fileds.

After date selection, press the Next and start splitting MBOX file with emails of specified dates.

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Step-6) Select the Split by Email Address from splitting options and apply required settings.
  • Input Email Address: - Choose an email address field To, From, CC, and BCC and enter email addresses.

    Note: - Also, split MBOX files with the subjects of emails.

  • Filter Emails: - Select and apply mail filter to export emails of chosen dates from MBOX files.
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Step-6) Select Split by year option to split MBOX with emails of selected years.
  • Select Year: - Choose years from "From" and "To" fields.
  • Custom Year: - Add start and end year in "From" and "To" field manually.

After year selection, press the Next button

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Step-6) Click on Browse and choose a location for saving resultant files

Finally, press the Split button and start splitting MBOX files.

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Merge Two or More MBOX into one file
Step-4) Hit the Split/Merge button and choose Merge MBOX file option, then click on Next.
save imap emails to local drive
Step-5) From the MBOX Merge options select the Merge All items option.

Note: - Use it to Merge MBOX files with all emails with any filters.

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Step-6) Choose Merge by Date option to split MBOX with emails emails of specific dates.
  • Select Date: - Enter a date in "From" and "To" fields.
imap to Outlook.com
Step-5) Use Merge by Year option to merge MBOX file with emails of chosen years.
  • Select Year: - Select years from the available list in "From" and "To" fields.
  • Custom Year: - Manually input a start and end year in "From" and "To" field.
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Step-6) Press the Browse button choose a saving location and press the Merge button and start Merging MBOX files

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