Converting OLM (Outlook for Mac) to PST (Personal Storage Table) manually involves exporting the data from Outlook for Mac and importing it into Outlook for Windows. Here's a step-by-step guide on how to do it:

Export Data from Outlook for Mac (OLM):
a. Open Outlook for Mac on your computer.
b. Go to the "File" menu and select "Export..."
c. Choose the items or folders you want to export. You can select the entire mailbox or specific folders.
d. Select the "Outlook for Mac Data File (.olm)" format and click "Continue."
e. Choose the destination location to save the exported OLM file and provide a name for it.
f. Click "Save" to start the export process. Outlook for Mac will create the OLM file containing your selected data.

Transfer the OLM File to a Windows Computer:
a. Copy the exported OLM file to a Windows computer using a USB drive, network sharing, or any other method of file transfer.

Import the OLM File into Outlook for Windows:
a. Open Outlook for Windows on the Windows computer.
b. Go to the "File" tab and select "Open & Export" > "Import/Export."
c. In the Import and Export Wizard, choose "Import from another program or file" and click "Next."
d. Select "Outlook Data File (.pst)" and click "Next."
e. Click on the "Browse" button and navigate to the location of the transferred OLM file.
f. Select the OLM file and click "Open."
g. Choose the options for handling duplicates or replacing items during the import process.
h. Select the folder where you want to import the data or choose to import it into a new PST file.
i. Click "Finish" to start the import process. Outlook will import the data from the OLM file into your Outlook for Windows.

Greetings,
Peter