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.ost,.OST (max 100MB)
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OST is Outlook Offline Storage Table, a cached copy of an Exchange mailbox that stores emails, calendar, and contacts locally for offline access. OST files are tied to specific Exchange accounts and cannot be opened independently, making them difficult to use for portable email archives.
PST is Outlook's Personal Storage Table format that stores email data in an independently openable file not bound to any Exchange account. Converting OST to PST liberates cached Exchange data into a portable archive that can be opened on any Outlook installation.
Yes, GoConvertFile offers free conversion of OST to PST for files up to 100MB. No registration required.
Most OST to PST conversions complete within seconds for standard-sized files. Larger files may take longer depending on the conversion complexity.
PST is ideal for email archiving, outlook backup and migration. Outlook PST - Personal Storage Table for email archiving
File size after OST to PST conversion depends on the content complexity and quality settings. Both formats use similar compression approaches so sizes are comparable.
OST (Offline Storage Table) is Microsoft Outlook's cached mailbox format for offline access to Exchange server data.
PST (Personal Storage Table) is Microsoft Outlook's file format for storing emails, calendar events, contacts, and other Outlook data locally.
Reach for OST when your priority is exchange offline cache, outlook data recovery — its uncompromising quality ensures every detail is preserved.
Reach for PST when your priority is email archiving, outlook backup and migration — its uncompromising quality ensures every detail is preserved.