Exchange 2013 and OWA app for iPhone

I'm simply trying to figure out if the new OWA app for iOS is simply an app to look at your cloud exchange and no actual email data lives on your iPhone.  I've looked online for this info but can't find anything in writing.  We are looking for an alternative to our ZixOne solution and want to ensure email does not live on the iPhone when using the OWA app to reach cloud hosted exchange.

Can anyone help verify this for me?
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Craig BowmanIT Services ManagerAsked:
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stu29Commented:
OWA app supports offline mode, which reading between the lines means that is downloads the emails and that they reside on the device

https://support.office.com/en-sg/article/OWA-for-iPad-and-OWA-for-iPhone-7edbf8c6-1a0e-4be8-a374-2809e754eaaf

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