You updated Outlook–now the window doesn't display. Here's the fix. (posted May 20, 2015). Affecting Yosemite users, after update 14.5.1 installs, the main Outlook window does not display, and you can't access email or folders. The Fix: Go to https://support.microsoft.com/en-us/kb/3048688 or use the Auto Update feature in any Microsoft Office program. Click Help and and select Check for Updates.