Question about Outlook Express

Hi guys.  I'm a Mac user and I use Outlook 2011.  Yesterday, my Mac updated to El Capitain and today Microsoft also automatically updated.  After this microsoft update I rebooted and tried to reopen Outlook, but it has lost all account details.  I had two email accounts set up on there (work and personal) and both have disappeared.  I had LOTS of folders, emails, contacts etc that I would be devastated to loose so if anyone could help me find and restore the relevant file I'd love you for ever!

Some questions I guess you'll be asking...no, I didn't have a back up (I know, I know) and I don't have these emails etc on the server - just on this laptop.

This is my first post and I'm not a techie so please be gentle with me...

Thanks in advance for any help you can give. 

I have tried re-indexing spotlight to fix this issue but to no avail. I receive the error- 'no emails found' after searching. Searching also works on the webmail so it is a problem specifically with Outlook.  Are there any known fixes for this issue?

Error Log says - A message in your Outbox could not be sent. The account which created the message cannot be found. There is nothing in my Drafts folder, nothing in my outbox, nothing on my computer. It could be from an account that was deleted. How do I get rid of this annoying error message? I don't really care about the unsent message. 

Appreciate help.

I am on a MacBook Pro using Outlook 2011 for Mac.

When I search for an email I cannot find in my inbox, I run a search using Search All Items or Search All Mail. When it finds these emails I want to know where these emails are stored and how to drag them into another email.