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Export mailbox as a PST file
Login to Outlook with the Exchange account that was used to create the OST files. And to export the OST mailboxes to PST, follow the simple procedure as given here:

Go to Files >Open & Export and click Import & Export.Import & Export
Select Export to a file; then click Next.Select Export to a file
Select the second option—Outlook Data File (.pst)—and click Next.Select PST file
Select the folder(s) which you want to export and click Next.Select the folder to export
Note: You have the option to include subfolders as well.

Browse the location where you want to save the new PST files and choose an option regarding the duplicate items.
Note: There is an optional choice to provide a password to the PST file, but you can easily move ahead without choosing it.

We might need to convert OST data files to Outlook PST files for a variety of reasons. To convert an OST file to a PST file, there are two methods.

1. Manual Method

2. Professional Software OST to PST Converter

If you're looking for an OST to PST file conversion tool, manual techniques are time-consuming and challenging. Therefore, let me recommend the OSTtoPSTAPP OST to PST Converter Tool to you. You may convert many different OST files to other file kinds, such as PST, MBOX, EML, PDF, MSG, etc., with the use of this program. It moves data from OST files, including emails, contacts, calendars, tasks, notes, and journals. The program preserves the OST files' organizational structure and data integrity.

Softaken OST to PST Converter software is an excellent tool to migrate Offline OST files into different other file formats and Email Clients without Outlook. This software converts OST files into multiple files format - PST, EML, EMLX, MSG, MBOX, NSF, TGZ, Office 365, etc. OST Conversion software has a simple user interface that does not require any prior technical knowledge to use. This software shows the preview option and safe conversion. Support all Microsoft Outlook versions such as - 2021, 2019, 2016, 2013, 2010, and 2007. It also works on Windows OS versions.

The Mailvita OST to PST Converter Tool is the best method to convert OST file to PST online. OST files, both single and several, can be converted to Outlook PST format with this utility without losing any data. Together with all corrupted Outlook OST email items, including the inbox, outbox, sent mail, notes, tasks, journals, drafts, and more, it also restores OST file data. Both technical and non-technical users can benefit from its many helpful features and conversion options. You can ask any technical questions you have about this converter 24 hours a day. All Windows and Mac OS are supported by this program. Additionally, it works with all versions of Microsoft Outlook, including 98, 2000, 2002, 2003, 2007, 2010, 2013, 2016, 2019, and 2021. You can use the free trial version of this software.

The manual ways for converting OST files to PST online are time-consuming and risks loss of information. So, users choose the automated software. Many Outlook users want to convert OST files to PST online but they did not find any safest tool. So, I suggested the FixVare OST to PST Converter software which can be helpful for Outlook users. The software has a simple GUI that makes the conversion process easy. I can choose the OST file that I want to convert and save it as a PST file with this tool. The software can work with all Windows operating systems. Users can also try this application demo version for free.