Those of you who were participating in the developer releases or public beta of Yosemite (or even the dot zero release) may recall that there was an issue with Outlook 2011 not displaying the main window if you had the disclosure triangle open to show your list of folders in your mailbox. Sad to say, the Office 2011 14.5.0 update has resurrected this issue. Outlook will launch, but the main window will not open. You can create new messages and events via the menus, but that's it. If you keep that disclosure triangle closed when you quit the application, it'll launch just fine again.
Solved
Office 14.5.0 update resurrects invisible main window issue
Best answer by joecurrin
14.5.1 just released to fix this issue. https://support.microsoft.com/en-us/kb/3048688
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