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Converting an OST (Outlook Offline Storage Table) file to PST (Personal Storage Table) manually can be a bit challenging, but it's possible using a method that involves recreating your Outlook profile. Here are the general steps to manually convert OST to PST:

Step 1: Create a New Outlook Profile
Open the Windows Control Panel.
Search for "Mail" or "Mail (Microsoft Outlook)" and open it.
In the Mail Setup - Outlook dialog box, click on the "Show Profiles" button.
Click the "Add" button to create a new profile.
Follow the on-screen prompts to set up your new profile. You'll need to provide your email account details.

Step 2: Configure the New Profile to Use Cached Exchange Mode
After creating the new profile, go back to the Mail Setup - Outlook dialog box.
Select your new profile and click on the "Properties" button.
In the Email Accounts window, select your email account and click on "Change."
Under the Microsoft Exchange Server section, check the box that says "Use Cached Exchange Mode."
Click "Next" and then "Finish" to save the settings.

Step 3: Open Outlook with the New Profile
Start Outlook with the new profile you just created.

Step 4: Export Data to PST
In Outlook, go to the "File" tab.
Click "Open & Export" and then choose "Import/Export."
In the Import and Export Wizard, select "Export to a file" and click "Next."
Choose "Outlook Data File (.pst)" and click "Next."
Select the folder you want to export (usually the main mailbox) and check the box that says "Include subfolders."
Click "Next" and choose a location to save the PST file. You can also set options for handling duplicates.
Click "Finish" to start the export process.

Greetings,
Peter