Why do you show me Outlook Plugin when I am on Linux?

Why do you show me Outlook Plugin when I am on Linux?

In the top navigation I am getting a link like http://www.zoho.com/business/39746644/ZohoCalendar_Outlook.exe (Outlook Plugin). What I would do with Outlook Plugin Executable sitting over here on a Ubuntu Linux. I would appreciate if you could have smart-detected my OS and got me a Thunderbird XPI rather.

----
Deepak Vasudevan
http://thamizhththendral.blogspot.com/