To access your Outlook.pst files from Outlook 2007 in Outlook 365, you can follow the steps below:
- Open Outlook 365 and go to the File tab in the top left corner.
- Click on Open & Export and then select Import/Export.
- In the Import and Export Wizard, select Import from another program or file and click Next.
- Choose Outlook Data File (.pst) and click Next.
- Browse to the location of your Outlook.pst file and select it, then click Next.
- Choose how you want to handle duplicates and click Next.
- Select the folder you want to import the data to and make sure that Include subfolders is checked, then click Finish.
- Wait for the import process to complete. Once it's done, you should be able to access your Outlook.pst files in Outlook 365.