Let's begin with Split By Folder option
Enable Split large folders into multiple NSF files if you want to divide folders that exceed a specified size limit. This option helps split large folders into multiple NSF files based on the configured threshold.

When Split large folders into multiple NSF files is enabled, specify the Split size and select the unit as MB or GB. Folders exceeding the specified size will be split into multiple NSF files.
Note: Select All Documents if you wish to include emails from all folders in the output NSF file. The selected emails will also be added to the All Documents folder.

Select the destination folder for the split NSF output. You can choose an existing folder or click Make New Folder to create a new one. Click OK to confirm the selected location.

After selecting the destination folder and setting the split size, click Split to start splitting the NSF file by folder.

Once the NSF splitting process is completed successfully, a confirmation message will appear. Click OK to close the message and continue.

After the splitting process is completed, the Record Count and Split Status are displayed for each NSF file. The Success File Count, Failed File Count, and overall progress are also shown at the bottom.

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