As I understood that you're not able to retrieve your contacts and calendars in your Outlook, this may be due to following reasons: if they are auto archived into archive folder or if they are deleted permanently from Outlook mistakenly. To see them back into Outlook, you need to recover them.
To recover the archived PST file, you need to use "import/export" feature to copy them back into Outlook from the archive folder location.
Open Outlook >> click on File >> click on Open & Export >> click on Import/Export >> click on Import from another program or file >> click on Next >> click Personal File Folder (.pst) >> click on Next.
To recover permanently deleted PST items, you need to use any third party utility.