Mac OS Maverick - Outlook issues

Hi everyone

I have 2 issues in MS Outlook (I'm using Mac OS Maverick)

Firstly, When I go to the search bar and type anything, the search doesn't work. There is no error. It just shows 'No results found'.

Secondly, I'm getting a few mails on my outlook where the MS word, MS excel, MS PowerPoint attachments are being converted to .dat file format. And this .dat file isn't opening.

Please help!