Oftentimes, Microsoft Outlook users who are leaving their current employer want to take their mail, calendar, or contacts with them and do one of two things - delete the Microsoft Exchange account from their profile without realizing the Contacts are stored in the Exchange account or they take the OST file with them, not realizing it can only be opened using the account that created it.
If you no longer have access to the computer that was used to create the OST or you don't have a restore point, you'll need to use a tool to recover the contents of the OST. A list of these tools is below. Note that OST2PST is free but will only work with OST files created by Outlook 2002 and older. If you aren't sure what version of Outlook you used, try it; an error means the OST is not the correct type.
DataNumen Exchange Recovery
The best tool to convert Exchange OST files to Outlook PST files. Main features: support Exchange 5.0 to 2013 and Outlook 97 to 2013; support to convert emails, contacts, tasks, appointments and all other items in OST files; support to repair and recover corrupt or orphaned OST files.
Kernel for OST to PST Converter
Kernel for OST to PST recover corrupt OST files. One can save recovered individual items in PST, MSG, EML, MHTML, MBOX formats. It can export OST files to cloud-based Office 365, email servers and also supports all MS Exchange and MS Outlook 2016/2013/2010/2007/2003/2002/2000/98 and 97 versions.
Stellar OST to PST Converter
The best tool that converts the MS Outlook OST files to PST file with secure conversion of emails, contacts, notes, calendar entries & journals. Supports both 32bit & 64bit of Outlook 2013 and Outlook 2016, with capability to convert encrypted OST file to PST file. You can preview mails before saving into PST file.
If your company uses a group policy that blocks PST creation, your choices are limited to exporting calendar and contacts to CSV (or Excel, if you have Excel at home). If you don't have many calendar or contacts, you can forward them to a personal address. If using Outlook 2007 or 2010, you can send your entire calendar as an iCal.
Note: Check company policies before taking home the contents of your mailbox.
If you deleted the Exchange account, you may be able to recover the account if your operating system supports system restore and you only recently deleted the account. If too much time has passed you are less likely to have a restore point available.
- Open the system restore application. In Vista it is at Start Menu, Programs, Accessories, System Tools.
Or enter %systemroot%\system32\rstrui.exe in Start search field or Start menu, Run.
- Pick a date just before the profile was deleted.
When Windows restarts the account will be back and you can move or export the contents of the OST to a PST. Then either delete the account or run restore again to return to the point made before the restore.
You can use Archive to move or copy many items to a PST - this method is best when you want to move almost everything in your mailbox. Note that you cannot archive Contacts. Set the AutoArchive default in Tools, Options, Other, AutoArchive and apply it to all folders. Then go to File, Archive and run it.
AutoArchiving uses the last modified date so you'll need to use a low number when archiving recent items. If you use Outlook 2007 or Outlook 2010 you can force AutoArchive to use the Received Date. See Using Microsoft Outlook's Autoarchive feature
If you use this method and also need the Contacts, you'll need to move them to the new data file.
Although Export is not usually recommended, when converting an OST to a PST, Export is generally a quick and easy way to move all content from the OST to a PST or just the calendar and contacts. If your company blocks the creation of PST files, export to CSV or Excel format.
Create a new PST in your profile and drag the folders you want to take with you to the PST. This method will preserve custom views and forms published to folder.
Dragging default folders, such as Inbox, Calendar, and Contacts, brings up a message that you can't move default folders. The contents will be copied instead, with the folder named Inbox (1), Calendar (1), etc.
If you don't have too many items you want to keep, you can email them to your personal email address. Select the item(s), right click and choose Forward. If you have many, you could drag them to a folder in My Documents, then zip the folder and email the zip file.
Outlook 2007 or Outlook 2010 users can email the entire calendar as a single iCal, provided they use Outlook 2007 or another calendaring application that supports multi-event icals at home. Older versions of Outlook do not support multi-event icals.
Tools in the Spotlight
Free OST to PST Converter. Convert OST to PST file, even if files are inaccessible. Free OST2 lets you convert orphaned OST file to PST, but only up to 5 items in each folder are converted. Using Enterprise Edition convert all OST files which are orphaned or connected to Microsoft Outlook. Make your Exchange emails, calendar, contacts accessible through Microsoft Outlook. To prevent Offline Storage .ost file's data loss, back up data as a PST file. OST2 is a perfect migration tool that can be customized to your needs.
DataNumen Exchange Recovery repairs and recovers corrupted Microsoft Exchange offline storage (.ost) files. Exchange Recovery can scan orphaned OST files and recover mail messages and other items, including folders, posts, appointments, meeting requests, contacts, distribution lists, tasks, journals and notes. The recovered items are saved in PST format readable by Outlook, Other important features: recover attachments and deleted items, recover oversized 2GB OST files, support to convert OST files into PST files.
Kernel for OST to PST software is the one-stop solution for all OST file corruption issues. It effectively repairs corrupt OST file and converts it into Outlook accessible PST file format. Individual email items can be saved in different formats including PST, MBOX, TXT, RTF, HTML, EML, MHTML, MSG and PDF. It also provides option to export OST files to Office 365 and different email servers and web mails. It supports all versions of MS Outlook (2016), MS Exchange Server (2016) and Windows OS (Windows 10). Free trial version of the tool is also available.
Exchange OST to PST email conversion tool to convert OST file to PST file. Convert working or unusable OST file to into PST file. Use it to migrates all Outlook items from Exchange Offline Storage (.OST) file to Personal Storage File (.PST). Software converts and repairs the offline storage file (ost) to personal storage (pst) file so that it can be easily accessed with Outlook. Other saving options include .EML and .MSG where former is accessible with Outlook Express and latter with Outlook. If the ost file gets corrupt or damaged, OST to PST functions as ost recovery software.
Stellar OST recovery software is the most efficient tool to convert Outlook OST file to PST file. The software successfully recovers all the components of .ost file such as emails, contacts calendar entries, attachments etc. The tool is able to convert OST file to working PST file in any instance of corruption. Free demo version is also available that previews all recoverable items of inaccessible .ost file.
OST PST viewer is a free and powerful tool that will help you to open and work with OST, PST and other Outlook file formats without Microsoft Outlook installed. PST file viewer is the right tool for users who have lots of PST files and don't want to connect each of them to Outlook. With the enterprise edition, you can change read/unread or follow up status of emails. Use advanced search to find exactly what you are looking for in your PST files.
Kernel OST Viewer is a FREE utility to view the contents of OST files. It does not require Outlook installation. A connection with Exchange is also not required. Just select the OST file and it will mount it in its Outlook like GUI instantly.
Free tool to convert older *.OST files to *.PST files. Works with ANSI format only, will not work with OST created by Outlook 2003/2007.