Outlook for Microsoft 365, Outlook 2021, Outlook 2019, Outlook 2016, Outlook 2013
This tool converts Offline Outlook Data File (.ost) to Outlook data file (.pst). You can also use this guide to export OST file to PST files, in case of data loss on the mail server, or when you need to recover a deleted, orphaned or inaccessible OST file.
IMAP accounts, Microsoft 365 accounts, Exchange accounts, and Outlook.com accounts use an Offline Outlook Data File (.ost) file to store a synchronized copy of your mailbox information on your local computer. Any items that are saved locally will not sync. For example, Calendar, Contacts, Tasks, and any folders marked Local only.
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, follow the steps below to recover 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.
The program can bulk convert PST to MSG in batch scripts using PowerShell, Task Scheduler and other automation tools. To do this, use the command line options of the product.
pstwalker.exe [filename] [/E[:msg|umsg|eml] [/Name[:Id|EntryId|Subject]] [/PATH:folder] [/FullScan] [/HardDeleted] [/HardDeletedOnly]]