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Microsoft Outlook inbox off-line folder
File type: Various data file, Microsoft Office file
An ost file extension is used for Microsoft Outlook Offline Folders files. The ost files are used to store e-mail messages and other data download from an Microsoft Exchange server. Microsoft Outlook Offline Folders files are very similar to Outlook personal folders files (.pst files).
File type category:
Various data file
Microsoft Office file
Date updated: December 20, 2024
The ost file extension is associated with Microsoft Outlook, a personal information manager, which is part of Microsoft Office, developed by Microsoft Corporation.
The ost file stores e-mail messages and other data saved by the application from an Exchange server or other mail server using IMAP protocol.
The ost files are very similar to the pst, but do not support large file sizes.
The ost files are created when the "Use Offline Folders" option is checked in Outlook and are stored on the hard drive instead of the e-mail server.
The default location of ost files are:
Windows Vista, Windows 7, Windows 8, Windows 10
\Users\user\AppData\Local\Microsoft\Outlook
Windows XP or Windows Server 2003
\Documents and Settings\user\Local Settings\Application Data\Microsoft\Outlook
Use Microsoft Office Outlook to open/import Microsoft Outlook inbox off-line folder files.
Kernel for Exchange OST Recovery can recover emails from OST files and then converts them PST format using Microsoft Exchange 5.0, 5.5, 2000 and 2003.
Software applications that can open ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software applications that can edit ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software capable of saving ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that create ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that import ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that export ost files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that recover ost files:
Microsoft Windows
Software applications that handle other tasks involving ost files:
Microsoft Windows
Apple macOS / Mac OS X
Multiplatform
The size of Outlook personal folder files are limited by the default settings of Outlook. The PST/OS...
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