My Inbox Tab has disappeared

My inbox tab has disappeared. I can only see the calender, task and contacts tab. Can someone tell me how to get my inbox tab back?

Hi Jehan, do you mean the mail tab in the left sidebar?
Right click any of the options you currently have visible and select “Mail” to be displayed.

After you check this option, the Mail tab should reappear in the sidebar.

Hope this helps,
Paul.