Follow the steps below to archive your Outlook tasks, notes, journal, and alternate calendars.
From the File menu, select Import and Export....
Select Export to a file, and then click Next.
Select Personal Folder File (.pst), and then click Next.
Every folder under your mailbox is displayed, including your notes, tasks, journal, and alternate calendars. Select the items that you want to archive, and then click the Next button. Note: If you wish to archive multiple items (such as your notes and tasks), you can repeat these steps as many times as necessary.
Choose a location to save to save the archive, and then click Finish. Make sure you can remember where you saved it!
The archive file is now saved. Follow the steps below to open the file so that it can be viewed in Outlook.
From the File menu, select Open, then Outlook Data File.
Browse to the pst file that you created in the steps above, and then click OK.
The archived item will appear in the left sidebar of Outlook.