Recovering from an Outlook 2011 Crash, I found that this third solution worked for me, but it is rather time consuming and does not speak well for the trustworthiness of the program:
If Rebuild or Repair Fails, try these steps:
(Warning this could result in data loss. Create a backup first)
1. Create a new Identity then quit Outlook.
Find your Identity folder in the Finder:
Your User’s folder/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records
2. The new Identity contains a Data Records folder.
3. Copy the Contacts, Events, Folders, Mail Accounts, Message Attachments, Message Sources, Messages, Note and Signatures folders into the new identity’s Data Records folder replacing the new folders from your Identity that will not rebuild or repair. NOT the root Data Records folder. Only the subfolders listed here.
4. When you open Outlook, select to rebuild the database