[Q] no "Exchange" option in my stock email app (4.4.2) unlocked GSM version topic

Dear all:

I need to use exchange to sync with my company's calendar.

I have noticed that other Nexus 5 has an "Exchange" option when one goes to Setting --> Accounts --> Add an Account --> Corporate
illustrated by this link:
http://support.sprint.com/support/tu...us_5/50282-118
(page 4 out of 8)

But my Nexus 5, which is also a stock ROM with no modification, doesn't even have this "Exchange option"
(see attached)

I desperately need that exchange option. How to get it? Is there an stock email app that I can download / flash?

My phone is rooted with no custom recovery installed. Can I get away without a custom recovery?


Thanks in advance


Harv

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