# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

.OST File Extension

TIP: Run a free scan for .OST file extension errors.

File Type	Outlook Offline Folder File
Developer	Microsoft
Popularity
Category	Misc Files

File Description

Stores e-mail messages and other data saved by Microsoft Outlook (2005 or later) from an Exchange server; similar to a Personal Folder (.PST) File, but supports larger file sizes.

OST files are created when the "Use Offline Folders" option is selected in Outlook and are stored on the local hard drive instead of mail server.

Program(s) that open .OST files

Windows

	Microsoft Outlook 2010	info
	Microsoft OST Integrity Check Tool	info
	SysTools OST Recovery	info
	OEMailRecovery.com Outlook Recovery Toolbox	info