Hey Barry,
It seems that your Outlook Data Files weren’t fully restored after recovering the data. The PST File might be facing corruption issues which might be hindering outlook to view its contents.
I would suggest you to scan and fix your PST File using Microsoft’s inbuilt Inbox repair tool : Scanpast.exe .
Located at : Office Installation Folder/Scanpst.exe
Feel free to revert back for further queries/assistance.
Thanks
~Dex