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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.

Microsoft OST to PST Converter is an effective software that easily Convert Outlook OST files to PST format without any data loss. It also recovers OST file data along with whole corrupted Outlook OST email items such as - Inbox, outbox, sent mail, note, task, journals, drafts, etc. ToolsBaer OST to PST Conversion software is safe and secure for Bulk Conversion. Microsoft Outlook and Windows OS versions are supported by this program. It also supports all Mac OS versions. Download the free demo version of the software to check its functionality.

OST to PST Conversion Tool is an excellent application to migrate from Exchange OST files into different other file formats and Email Clients without MS Outlook. This utility converts Offline OST files into multiple files format - PST, EML, EMLX, MSG, MBOX, NSF, TGZ, Office 365, etc. Conversion from OST file to PST Software has a simple user interface that does not require any prior technical knowledge to use. Softaken OST to PST Converter 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. It is available as a demo version so that users can download it for a free evaluation and can License the full version later.

Thaks for solution

Thanks all of you for your wonderful suggestions!!

I have just got a solution for converting my multiple OST files into PST format. This can be only possible by using ZOOK OST to PST Converter which lets you to convert my multiple large-size OST files into PST format. Even after the conversion, I have got good results and all emails will remain intact in same hierarchy of folders without any disturbance. The tool fully supportable to Outlook 2007 as well as Outlook 2021 without any issue.

I would suggest you try its FREE Demo as well.

You can choose the best solution as an Outlook OST to PST Converter Tool. If you want to know which is the best OST to PST Converter Tool, then you can try the WholeClear OST to PST Converter Tool to convert single or multiple OST files at once into PST format, and it works without the need for Exchange Server and MS Outlook. You can install this software on Windows 11, 10, 8.1, 8, 7, XP, and Vista operating systems. This utility provides a simple graphical interface so that users will get user-friendly features that are easy for non-technical users. After installing this Outlook OST to PST Converter Tool, you will get a free demo to use its features by converting a few OST files into PST format without MS Outlook.

Outlook Users need to convert an Outlook OST file to PST but they did not find any safest tool. So, I suggested the FixVare OST to PST Converter software which can be extremely helpful for the users. The software has a simple GUI, making the conversion process easy and efficient. I can easily choose the OST file I want to convert and save it as a PST file. The solution ensured a smooth conversion of Outlook data by maintaining the original folder structure and data integrity. The software can work with all Windows operating systems.

The TrustVare OST to PST Converter Tool is the best tool for swiftly converting big volumes of OST data to PST files. It preserves all of your data, including emails, calendars, tasks, events, and other data, while converting. This tool allows you to extract to and from email addresses as well as BCC. You can use this tool to fix damaged, orphaned, or inaccessible files before converting OST files to PST. Password-protected OST files can also be converted to PST files. It will ask for your permission and the location where you want to save the generated files before storing them. The Outlook OST to PST Converter Tool works with every version of Microsoft Outlook, including 2021, 2019, 2016, 2013, 2010, 2007, and 2002.

**Goldytools OST to PST Converter** is the premier software for exporting OST files to PST format. This reliable tool is designed for both professionals and everyday users, ensuring a seamless conversion experience. It efficiently converts all OST files to PST while also repairing corrupted files without hassle. 

One of its standout features is the ability to quickly export large files, handling up to 20 items from each folder, including all attachments, in just seconds. Additionally, this versatile recovery tool supports all versions of Windows OS and Outlook Exchange Server, making it an essential choice for anyone in need of OST to PST conversion.

The Mailvita OST to PST Converter for Mac Tool allows you to safely move offline OST files to PST Outlook. This software transfers all emails, attachments, contacts, calendars, and notes from OST to PST files without any technical issues. This program maintains the original data structure during the conversion process. This software works with all Windows versions, including 11, 10, 8.1, 8, and 7. It also supports MS Outlook versions 2007, 2010, 2013, 2019, and 2021. it gives customer service 24 hours a day, seven days a week. It restores all corrupted OST databases. Download the free demo version to test.
 

Thanks for solutions

Thanks for solutions