Follow the Steps to import single as well as multiple Outlook PST files into Microsoft Office 365 account:-
Step 1: Download, Install and Run Import PST to Office 365 Software. Now, the software shows you two different ways to add a PST file: Select Single File or Select Folder.
Step 2: Click the Select Path button to browse your system's Outlook data file(.pst) and tap Open.
Step 3: Once you browsed the PST, click Next.
Step 4: The software displays all the added Outlook PST files. Click Next to proceed further.
Step 5: Enter the Office 365 email address and click the Sign In button to log in with the Modern Authentication process.
Step 6: Check the Remove Duplicate Mail option to exclude similar items from the Mail, Calendar, Contact, Task and Notes based on different criteria.
Step 7: Choose these options:-
Step 8: Click the Import CSV button to select the CSV file>>Open.
Step 9: Here, your connection is established successfully. Click Ok.
Step 10: Select the Mailbox User ID and click Next.
Step 11: Now, you need to map the Source and Destination accounts.
Step 12: Set the Mailbox(Mailbox/Public Folder/Online Archive) for the destination Office 365 account.
Step 13: Click the Convert button to start importing PST files into Office 365.
Step 14: At last, all your migration process is completed successfully.
After downloading the Aryson Import PST to Office 365 Software, you will find the welcome screen as played below.