When rebuilding, restoring and upgrading fails, you can recover your data. Outlook stores your data in the Data Records folder in your Identity folder.
~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity/Data Records
If you restore your Identity from Time Machine or another backup and it fails to rebuild, or you upgraded to Service Pack 2 (SP2) 14.2.1 and you have missing data you can restore your data from your old Identity. ALWAYS WORK OFF A COPY . . .
Continue Reading: How to recover your data when rebuilding, restoring and upgrading fails
DO NOT DOWNLOAD Service Pack 2 (SP2) 14.2.0. This update contains problems that were fixed in 14.2.1. You can go directly from 14.1.0 or higher to 14.2.1. SKIP the 14.2.0 updater. [Added May 3, 2012]
If you get the following error “Your identity is older than this version of Outlook” you will need to revert to Office 2011 v14.1.4 in order to repair your identity.
If you want to remove Office 2011 v 14.2.0 . . .
Continue Reading: Error: Your identity is older than this version of Outlook
Be sure your Identity does not contain hidden corruption by testing with the Entourage Database Utility and exporting your data as Entourage archive and MBOX files. Includes help to successfully rebuild your Identity. . . .
Continue Reading: Is corruption hiding in your database?