Softaken Free OST Viewer interface
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Free OST Viewer

Install the freeware to view OST files without installation of MS Outlook

OST stands for Offline Storage Tablethat stores all MS Outlook items including notes,journals,calendars,tasks etc. An OST file can be accessed in the MS Outlook environment. What will happen if you try to open an OST file without MS Outlook? It cannot be opened. If you still need to open it,install the OST file Viewer. It is a sophisticated program which is free to download. You are not going to pay a penny to install the tool. Use it at free of cost.

100% standalone OST reader — open,read,and examine Outlook OST files without requiring Microsoft Outlook or Exchange Server installation.
  • Allows you to access whole items of OST files including emails,contacts,calendars,notes and journals
  • Free to download (freeware)
  • An independent and standalone tool — doesn’t require installation of MS Outlook to view OST files
  • Works smoothly;supports any size OST files
  • Filter file option to view your desired OST files
  • Supports Windows OS including 8,10,XP and Vista (see specs for current list)
No Outlook neededNo Exchange installAny size OSTFreewareWindows
EmailsContactsCalendarsTasksNotesJournals

Browse your system to open the specific OST you want. Folder list appears on the left pane so you can pick folders and view them one by one. Email properties such as To,From,CC,and BCC are supported.

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Software interface

Browse OST,folder tree,item list,and preview panes.

Browse and select an Outlook OST file1

Browse OST file

Use Browse to locate and open the OST file you want to view with the file filter facility.

OST folder hierarchy,email list and message preview2

Folder list &preview

Left-side folder list,mailbox items,and preview — emails with To,From,CC,BCC and other Outlook items such as contacts,calendars,notes,tasks and journals.

Click a screenshot to enlarge. Interface shots show Softaken OST mailbox UI used with this freeware family.

Why use Free OST Viewer

No Outlook required

View and read OST files without an MS Outlook environment — including during weak or no connectivity with Exchange Server.

Whole mailbox items

Access emails,contacts,calendars,notes,journals and tasks. Email properties such as CC,BCC,To and From are supported.

Safe viewing

Error-free view — no file is damaged or corrupted when you open the selected OST. Original content is not changed by the safe OST reader.

Key Characteristics of OST File Viewer

A Standalone Application

OST Viewer is a standalone tool that allows users to view emails that exist in the OST file without an MS Outlook environment. Users can view and read OST files without any support of MS Outlook. Easily view OST files during weak or no connectivity with Exchange Server.

Support Whole OST Items

The OST file created by MS Exchange Servercontains important information like notes,tasks,contacts,messages etc. With OST Viewer,users are able to view whole items of OST files with just a few simple clicks. It supports whole email properties like CC,BCC,To and From.

File Filter Facility

OST Viewer supports viewing those OST files that you have selected to view. Browse the system to search the specific OST file you want to open.

Error Free View

OST Viewer offers error-free view. No file is damaged or corrupted when users want to open the selected OST file. It is a sophisticated tool that takes care of your important OST files.

Complete and Detailed View

Freeware OST Viewer application provides a complete list of OST folders on the left side of the software panel. You can pick the folders of your choice from the left pane and view them completely one by one.

Grant Any Size OST File

The application doesn’t create trouble opening any size OST file. You can view any large size OST file using the freeware. Users don’t have to fear about file corruption. Quality and systematic view is provided by the software.

Free Viewer vs OST File Exporter

Clear freeware vs convert/export product boundary.

CapabilityFree OST ViewerOST File Exporter
License100% freeware ($0) to install and viewPaid convert/export product (demo available)
Open / view OSTYes — view mailbox items without OutlookYes — plus export workflows
Folder list &item viewYes — left folder pane;view folders one by oneYes — preview before export
Convert / export (PST,EML,MBOX,MSG,etc.)Not on this freeware pageYes — see OST File Exporter

Free OST Viewer FAQs

No. Softaken Free OST Viewer is a standalone freeware — there is no need to install MS Outlook to view OST files. You can also view OST files during weak or no connectivity with Exchange Server. Original product copy does not require an active Exchange profile to open files for viewing.
The page describes opening and viewing OST files without Outlook / Exchange installation,including during weak or no Exchange connectivity. Explicit “orphaned” or “deleted-user OST recovery” wording is not listedas a separate Free OST Viewer feature. Use the file filter to browse and open the OST you select.
Product documentation (PAD) lists support for OST related to Outlook 2016,2013,2010,2007,2003 and lower. Outlook 2024 / 2021 / 2019 / Microsoft 365 are not namedon this Free OST Viewer page — do not assume them from this listing alone.
Yes for mailbox items listed here:emails,contacts,calendars,notes,journalsand tasks,plus email properties To,From,CC,and BCC. Folders appear in a left-side list so you can view them one by one. Embedded attachment preview is not called outas a separate Free OST Viewer feature on this page.
Any / large sizeOST files are supported for viewing. Password-protected,encrypted,or corrupted OST open/recovery is not listedon this Free OST Viewer page. The copy emphasizes that the tool itself does not damage or corrupt your OST when viewing.
No — not a single change will be created to the OST file and its content by the safe OST reader. No file is damaged or corrupted when opening. Dedicated “forensic / bit-level / RFC Message-ID preservation” wording is not listedon this page.
Sender / keyword / date search inside the mailbox is not listedon this product page. “Search” in the original copy refers to browsing the system to find the OST file you want to open,then viewing folders from the left pane.
Yes — Softaken Free OST Viewer is freeware($0);you do not pay to install it for viewing. There is no “Pro Viewer” SKU on this page. For conversion/export of OST files,Softaken offers a separate product — OST File Exporter— which is not the same as this free viewer.

Software Specifications

100% Free OST Viewer— freeware to install and view as described on this page. View-only freeware;conversion/export is handled by Softaken’s separate OST File Exporterproduct.

What you get:no Outlook required · weak/no Exchange connectivity viewing · left folder list · emails,contacts,calendars,notes,journals,tasks · To/From/CC/BCC · any size OST · file filter to open the desired file.

Safe viewing:Error-free view — the tool does not damage or change the OST file and its content.

FreewareNo OutlookAny size OSTWindows

Product Info

LicenseFreeware ($0)

TypeView-only freeware

PlatformWindows only

Related convertOST File Exporter

Formats &Items

InputOutlook OST

Outlook itemsEmails,contacts,calendars,notes,journals

Also viewTasks;To,From,CC,BCC

File sizeAny / large size OST

Viewer Capabilities

Outlook requiredNo

Exchange installNot required to view

FoldersLeft-pane folder list

FilterOpen desired OST file

System Requirement

ProcessorAny Pentium Class

Operating SystemWindows 11,10,8.1,8,7 &Other

Memory512 MB Minimum

Hard Disk100 MB free space

Interface Available

Language SupportedEnglish

Support OptionEmails,Chat &Skype

GuidesUser Manual

HelpPurchase Related FAQs

Client Reviews

Bichler Verified

Austria

★★★★★
I have a huge pile of OST files and I want to view them. After a lot of struggle,I found OST Viewer and with the help of it,I was able to view these files quickly within few simple steps.

Raman Verified

Indonesia

★★★★★
The software has only three steps to view all size OST files and it worked quickly with the easily rememberable steps. The whole task got completed in few moments.

Rahlf Verified

United States

★★★★★
I have some OST files but could not access these files because now I don’t have MS Outlook installed on my system. I was looking for a reliable tool for a long time and finally,I got OST reader tool from one of my friend.

Holland Verified

Netherlands

★★★★★
It is a highly supportive tool to view OST files completely. I used this tool to view my thousands of OST files and got detailed viewing of these files. Really a big thank to Softaken team for this freeware.
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Frequently asked questions

Do I need Microsoft Outlook or an active Exchange Server connection to open and read OST files?

No. Standalone freeware — no MS Outlook installation required;works with weak or no Exchange connectivity.

Can this free viewer open orphaned or disconnected OST files from a deleted user account?

Standalone viewing without Outlook/Exchange install is described;explicit orphaned/deleted-user recovery is not listed separately.

Does the tool support viewing OST files generated by modern Outlook versions (2024,2021,2019,Office 365)?

PAD lists Outlook 2016–2003 and lower. 2024/2021/2019/Microsoft 365 are not named on this page.

Can I inspect embedded email attachments,contacts,calendars,and tasks inside the OST file?

Views emails,contacts,calendars,notes,journals,tasks and To/From/CC/BCC. Attachment preview not listed separately.

Does the software support opening heavily oversized,encrypted,or corrupted OST files?

Any/large size OST supported. Encrypted or corrupted OST open is not listed.

Will opening an OST file in this viewer alter its internal database structure or RFC headers?

Safe OST reader — does not change OST content. Forensic/RFC bit-level wording is not listed.

Is there an option to search for specific emails by sender,keyword,or date within the OST file?

Mailbox sender/keyword/date search is not listed. Browse folders from the left pane after opening an OST.

Is this OST Viewer completely free forever,and how does it differ from the Pro OST Exporter version?

Yes,freeware for viewing. Conversion/export is Softaken OST File Exporter,a separate product.

Free OST Viewer specifications
ItemDetails
ProductFree OST Viewer
PublisherSoftaken Software
PlatformsWindows
InputOutlook OST
LicenseFreeware ($0)
Related convertOST File Exporter
Pagehttps://www.softaken.com/free-ost-viewer