Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, Outlook 2007
This tool converts Offline Outlook Data File (.ost) to Outlook data file (.pst). You can also use this tool to export or backup email, contacts, and calendar to an Outlook .pst file in case of data loss on mail server or when you need to recover deleted, orphaned or inaccessible .ost file.
Most of the data stored in Offline Outlook Data Files (.ost) remains on the server; however, any items that are saved locally should be backed up. For example, Calendar, Contacts, Tasks, and any folders marked Local only. You should periodically backup all of your email, contacts, and calendar to a safe place. After you convert ost to pst file format, copy the .pst file to a safe location: a USB flash drive, another hard drive, or cloud storage.
When an OST file can be opened in Microsoft Outlook, you can use it to export items by creating a PST file. If you're using Cached Exchange Mode, Outlook will only export the items in your current cache. By default, Outlook configures Exchange and Microsoft 365 accounts to only synchronize 12 months of your email. Follow the export instructions to move your email from the OST file to a PST file. To export more than the past 12 months of data, turn off Cached Exchange Mode first.
If you have Outlook connection issues with mailbox on a server or cannot open your OST file, use PST OST Viewer to open and export items from your OST file.
Follow this steps to export or backup email items from an OST file, including damaged, orphaned or inaccessible .ost files:
Follow this steps to export deleted items from the mailbox:
After your email data is exported to a PST file, it's portable! You can save the .pst file to a portable drive; then open it with PST Viewer.
OST files contain your important and confidential data. When you use an online service to convert email from OST to PST, all of your sensitive data, including private messages, contacts, tasks and notes, is transferred to someone else's server. The data is processed on an unknown computer and you have no control over it. Only then will you be able to download the resulting PST file.
Unlike online converters, our utility works strictly on your computer. Information from the OST data file is not uploaded anywhere. Your data will not fall into the wrong hands.
There is no limit on the number and size of the converted OST files and the resulting PST files. You can convert unlimited files as often as you like.