One of my colig complaint his Open Office Calc Worksheet tab went missing. I’m not sure how he manage to hide the worksheet tab. But after some reading at Open Office forum, i found the solution to show the Calc Worksheet tab again.
This is how it looks when Worksheet tab is missing:-
This is the normal view with worksheet tab visible:-
If your Open Office Calc Worksheet Tab went missing, follow the steps below to enable it:-
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if you dont have ssh access to zimbra server and wanted to know which version of zimbra you are running, here’s a trick for you to check your zimbra version. 
Recently when i try to connect Wifi Network that has “WiFi protected setup complaint” (padlock with 2 keyholes), it prompt me to choose to Easy Setup (push a button from wifi station) or Pin Method (enter a pin). No matter which method i choose, all end up failed to connect even i have the password. After some googling, i finally found the solution.