Method 1: Convert OST files into PST and upload to Office 365
This is an indirect method which involves two steps:
Convert OST file to PST file
Import PST file in Office 365
Step 1: Convert OST files to PST file
Open the Outlook account and go to “File”.
From the File option, click “Import and Export.”
Select the option: Export to a file and click “Next.”
Select PST option and click “Next.”
Select the emails or folders. Select the checkbox for “Include Subfolder”. Click “Next”
Browse to specify the location to save the PST file
Select the checkbox for “Replace duplicate with items imported” and click Next
Provide a password to the PST file, if required.
Click “Ok” button to export the PST file.
Step 2: Import PST file to Office 365 Account
Log in to your Office 365 account and go to Admin Center of Exchange Server
Exchange Admin Center (EMC) window will appear. Go to Permissions and double click on Organization Management.
a) A new popup will appear. Click the “+ sign” and select Mailbox Import Export.
b) Click on the Add button and choose Ok
Again, select Mailbox import-export and choose Save
Go to Admin Center and select the Setup followed by Data Migration. Click on Upload file.
Select the New Import Job and provide a job name. Click on the Next button
Select the checkbox for Upload Your Date and click on Next
From the available window, click the option – Show Network Upload SAS URL.
Copy that URL & paste on the notepad.
Download and install Azure AzCopy
Note: Provide necessary folder or file permissions to import the PST file to Office 365 format. You can also copy the files or folders directly to PST file, available on Network Path.
Open the Microsoft Azure AzCopy tool and type here the following: AzCopy.exe /Source: \Network Path or File location /Dest:” SAS URL”/V: location path where you want to save log file /AzCopy.log /Y
Press the Enter key
Once the PST file is created, the next step is to create a CSV file to map PST fine into mailbox account
Open the import data window and check on both options and click on Next
Click on the following: Select the Mapping file — Upload CSV file — Validate — Save
Your PST file successfully uploaded into Office 365. Click on the Close button.
I hope this method will be helpful to convert OST to Office 365 manually.