Q:

Mac Outlook 2011

I am using an iMac with Outlook 2011 installed.  Until last week, there was no issue.  Now, when I open Outlook, it initializes but does not open. 
I tried rebuilding the database, twice.  After Googling, I found instructions to delete com.Microsoft.outlook.plist file, restart the system and test if it works. 
I did so, and now every time I want to use outlook.  I need to delete the same file to open outlook.  
I tried to re-install office 2011, without success. 

A:

This is a known issue with the latest 14.5.0 update:
https://derflounder.wordpress.com/2015/05/16/office-2011-14-5-0-and-outlook-main-window-invisibility/
I suggest you update to 14.5.1 which contains a fix for this problem:
https://www.microsoft.com/download/details.aspx?id=47307

