Thu, 16 Apr 2026 22:41:30 +0000

Stop Losing MST Folders Forever—Discover the PST Conversion Now! If you’ve ever worked with Outlook .pst files but suddenly lost access to critical folders—only to realize they disappeared completely—you’re not alone. MST (Outlook Data File) folders can vanish without warning, especially when migrating, renaming, or migrating emails between Microsoft Outlook versions. But don’t worry: converting your .pst to .pst.net or using reliable PST conversion tools can save your data forever. ### Why MST Folders Disappear MST folders were historically used in older versions of Outlook for storing mailbox data, especially when integrating with Exchange or protecing data using persistent collections. However, these file formats are no longer natively supported or secure in newer Outlook versions. When Outlook updates or folders move without proper conversion, MST files often become inaccessible or corrupted—leading to lost emails, calendars, contacts, and attachments.