OST vs. PST: Know the Difference
By Shumaila Saeed || Published on January 21, 2024
OST (Offline Storage Table) stores an offline copy of mailbox items, allowing offline access. PST (Personal Storage Table) is a file format for storing personal information by Microsoft Outlook.
Key Differences
OST (Offline Storage Table) is used by Microsoft Exchange Server, allowing users to work with their messages and mailbox data even when access to the mail server isn't available. PST (Personal Storage Table), on the other hand, is a personal folder file in Microsoft Outlook used to store copies of messages, calendar events, and other items.
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Jan 21, 2024
OST files synchronize with the mail server once a connection is reestablished, ensuring that any changes made offline are updated. Conversely, PST files are used for storing data from Outlook for backup purposes, not relying on server connection for synchronization.
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Jan 21, 2024
OST files facilitate collaboration and server-based mailbox management, making them essential for enterprise environments. In contrast, PST files are more suited for individual use, providing a simple solution for data storage and backup.
Shumaila Saeed
Jan 21, 2024
OST files tend to be more vulnerable to corruption due to their constant synchronization process. PST files, being used primarily for backup, are less prone to such issues but are not immune to corruption or data loss.
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Jan 21, 2024
OST files are inherently connected to the account configuration on the hosting server, making them less portable. PST files are standalone and can be transferred or opened by different Outlook profiles, offering greater flexibility.
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Jan 21, 2024
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Comparison Chart
Synchronization
Syncs with server when online
No synchronization with server
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Jan 21, 2024
Vulnerability to Issues
More prone to corruption due to syncing
Less prone, but not immune to issues
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Jan 21, 2024
Portability
Less portable, tied to account config
Highly portable across Outlook profiles
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Jan 21, 2024
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OST and PST Definitions
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OST
Ocean Surface Temperature.
Researchers are analyzing OST data for climate studies.
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Jan 03, 2024
PST
Public Safety Telecommunicator.
He works as a PST in the emergency department.
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Jan 03, 2024
PST
Standard time in the 8th time zone west of Greenwich, reckoned at the 120th meridian west; used in far western states of the United States
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Jan 02, 2024
Repeatedly Asked Queries
What is an OST file?
An OST file is an Offline Storage Table used by Microsoft Exchange Server for offline mailbox access.
Shumaila Saeed
Jan 21, 2024
Is OST used only in enterprise environments?
Primarily, OST is used in enterprise settings, but it can be used in any environment with Microsoft Exchange Server.
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Jan 21, 2024
How do I create a PST file in Outlook?
A PST file can be created in Outlook through the 'New Items' > 'More Items' > 'Outlook Data File' path.
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Jan 21, 2024
Can OST files be accessed without a connection to the server?
Yes, OST files can be accessed and used offline.
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Jan 21, 2024
Can OST files be converted to PST?
Yes, OST files can be converted to PST for different purposes like backup or migration.
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Jan 21, 2024
What's the maximum size of an OST file?
The maximum size of an OST file can vary but is typically set by the server or system admin.
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Jan 21, 2024
What does PST stand for?
PST stands for Personal Storage Table, a file format in Microsoft Outlook.
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Jan 21, 2024
Are PST files secure?
PST files can be password-protected, but they are not encrypted by default.
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Jan 21, 2024
How can I back up my PST file?
You can back up a PST file by copying it to another location or drive.
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Jan 21, 2024
Can I open a PST file in different Outlook profiles?
Yes, PST files are portable and can be opened in different Outlook profiles.
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Jan 21, 2024
Can I password protect my OST file?
OST files do not have an inherent password protection feature.
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Jan 21, 2024
How do I import data from a PST file?
Import data from a PST file using Outlook's 'Import and Export Wizard.'
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Jan 21, 2024
What happens if an OST file gets corrupted?
If an OST file gets corrupted, it can often be repaired or re-synced with the server.
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Jan 21, 2024
What are the limitations of PST files?
PST files can become large and unwieldy, and they are also prone to corruption.
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Jan 21, 2024
Do OST files update in real-time?
OST files sync and update in real-time when connected to the server.
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Jan 21, 2024
Are there size limits for PST files?
Yes, the size limit for PST files depends on the Outlook version but typically ranges from 20 GB to 50 GB.
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Jan 21, 2024
Why would I use a PST file instead of OST?
Use a PST file for personal data backup or when not using Microsoft Exchange Server.
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Jan 21, 2024
What is the default location for OST files?
The default location varies but is usually in the 'Users' > 'AppData' > 'Local' > 'Microsoft' > 'Outlook' directory.
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Jan 21, 2024
Can I access a PST file from multiple devices?
Yes, if the PST file is stored in a shared location.
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Jan 21, 2024
How do I recover deleted items from an OST file?
Recover deleted items by syncing with the server or using specialized recovery tools.
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Jan 21, 2024
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About Author
Written by
Shumaila SaeedShumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.
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