Preserving mailbox organization during format conversion is essential when trying to backup IMAP emails to PST without losing folder hierarchy, since several manual approaches flatten custom folder structures or fail to replicate nested subfolders correctly in the resulting PST file. Setting up the IMAP account in Outlook and then exporting to PST through Open and Export preserves folder structure reasonably well for standard folders, but custom folders created outside the default IMAP folder set sometimes get skipped during the export depending on how the original server organized them. This manual method also requires the IMAP account to remain configured in Outlook throughout the export, which becomes impractical when multiple accounts need backing up across different mailbox structures. SysInfo IMAP Backup Tool preserves the original folder hierarchy throughout the backup process, displaying a tree-structured preview of all mailbox folders before conversion begins so the structure can be verified ahead of time. The Date Filter narrows the backup to a specific period when only recent data needs preserving, and the option to split PST into smaller files helps manage large mailbox archives without compromising the folder organization. Compatible with all Windows versions, including Windows 11.
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