HI Naga

This link should help

>> http://mkt.tableau.com/files/Tableau-Maintenance-Policy.pdf

Found via >> Support Services | Tableau Software

If you haven't been contacted by your sales manager, I would suggest emailing - customersuccess@tableau.com

Cheers

Mark

and the FAQs (accessible through the above linked document

>> http://mkt.tableau.com/files/Tableau-Product-Maintenance-FAQs.pdf

Mark's answer is spot on! As an addition to this, occasionally the maintenance has been renewed by your accounting department, but the maintenance date needs to be refreshed on your machine (it's not automatic upon payment).

From Desktop, go to: Help > Manage Product Keys > click Refresh. If the maintenance has been renewed, this will bring in the new end date. If not - reach out to the above resources Mark noted.