Using older versions of Outlook for Mac in business environments
Hi
You will get this error message whenever you try to open an identity made with a newer build of Outlook in an older build of Outlook.
The cure is to install Office updates. The current update of Outlook 2011 is 14.7.7 and if you install that update you will be able to open the identity.
To install updates, go to the Outlook menu and choose Check for Updates. If it says you have the latest update but you don't have 14.7.7 then download the latest AutoUpdate version and try again.
Download a copy of the current version of AutoUpdate from this link, install and then run AutoUpdate to bring your installation to current update level, then restart your Mac. If the updater does not open automatically after download, double-click the downloaded .pkg file. Click this link to download the updater. The update is free.