How To Convert OST Files To PST In Outlook365?

To convert OST files to PST for use in Outlook 365, start by installing the SysInfo OST to PST Converter. Launch the tool and load the OST files you want to convert. The software gives you a full preview of all the emails, contacts, calendars, tasks, and attachments in your OST files. Next, select PST as the desired output format and choose the folder where you want to save the converted file.

To convert OST to PST in Outlook 365, use one of these methods:

Manual Export (if OST is connected to Exchange):

Open Outlook > File > Open & Export > Import/Export > Export to PST.

Third-Party Tools (if OST is orphaned/corrupted):

Use tools like SysTools OST to PST Converter or Stellar Converter for OST.

Reconnect OST (if Exchange is accessible):

Re-add the account to sync data, then export to PST.

Note: Backup OST files before conversion.

se Outlook Export – Open Outlook, go to File > Open & Export > Import/Export, choose Export to a file, select PST, and save.
Use Outlook Archive – Enable AutoArchive to move OST data to a PST file.
Use Professional Tools – Third-party OST to PST converters can simplify the process.

I agree with Amanda M's steps above. Very straight forward and useful gudie there

Converting an OST to a PST file in Outlook 365 can be somewhat tricky but is quite possible. As I found out for myself, here's how:

Export via Outlook: This is the easiest way to convert an OST file into a PST using the export feature in Outlook itself. I directly go to File > Open & Export > Import/Export, click "Export to a file," and then select "Outlook Data File (.pst)". Further, I am allowed to choose those folders that I want to export and save as a PST file.

Step 1: Download and install the Emails OST to the PST Converter tool.
Step 2: Choose the OST file from any Outlook version.
Step 3: Select the mail items and folders for PST conversion.
Step 4: Convert the Outlook OST file to PST format. That's it!

This is the most straightforward way to convert your OST file to PST. Here's how to do it:

Open Outlook: Launch your Outlook application.
Open Import/Export Wizard: Go to the File tab, then select Open & Export, and finally choose Import/Export.
Select Export to a File: Choose this option from the Import and Export Wizard and click Next.
Choose Outlook Data File (.pst): Select this option and click Next.
Select the OST File: Choose the OST file you want to convert and select the fold

If you want to perform an OST to PST conversion in Outlook 365, you can do it by yourself. First, start Microsoft Outlook on your computer. After that open the File tab. Next click on Open & Export, and Import/Export. Export to a file and proceed next. See then choose Outlook Data File (.pst)and hit Next. export the specified folder or the complete account for which you want to export the folder and make sure you check the Include. Otherwise, use WebbyAcad OST to PST converter tool.