How to open a local client archive .ost file on a new computer

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.OST files
Microsoft Outlook 2013
How to open a local client archive .ost file on a new computer We use Exchange 2010 Standard and Outlook 2013. I got a new computer and made a copy of my email archive that was being stored on my Windows 8 computer under c:usersUserNameAppDataLocalMicrosoftOutlook. Now I want to open the archive to look for an old message. Outlook 2013 won't open the file. Error, "The file you chose is not an Outlook Data File. You must select a new file of this type." Outlook 2013; File Menu; Open & Export; Open Outlook Data File - that will open the file browse window with the file type of Outlook Data Files listed. To show the archive, I had to change it to All Files.  The file extension is hidden, but the details of it show the Type is "Outlook Data File". If I try to open it, I get the error above.  Looking at the properties of the file, it is an .OST Outlook Data File. I know that Outlook wants to open a .PST file, but I need to open an .OST file. The Exchange Server did not change. The network user did not change. The only thing that changed was the old computer was removed from Active Directory and the New Computer was added - and the network user properties was updated to the new computer.

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  • Subhendu Sen
    Look this link and probably you will get help: https://support.office.com/en-in/article/Move-an-Outlook-data-file-from-one-computer-to-another-e7b2e7b2-fb87-406c-85c7-04d4b69cf9a0
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  • Alex456
    OST-files aren't intended to be reused. You need to reconnect to Exchange and Outlook will recreate the cache again.
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  • vedshoviv
    Hi there,

    As far as I know, to open archive OST file on a new computer, first you need to convert OST to PST file and then you can open into Outlook.

    Read this post to know how to convert OST to PST: 
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  • vedshoviv
    Shoviv OST to PST Converter software could be the best way to convert OST to PST files.
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  • Subhendu Sen
    OST files serve as valuable backup option for Microsoft Outlook data. However, the job is accomplished only when OST files are converted to readable PST files. Please link here for Microsoft support, https://support.office.com/en-gb/article/open-or-import-items-from-an-offline-outlook-data-file-ost-a584963e-a66d-4d9d-8845-31cb270f6880
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  • ToddN2000
    Not knowing all the details of your situation, if going from one version of Outlook to a newer version, you may run into compatibility issues.
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