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Found this answer after posting the question.
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Found this answer after posting the question.

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vCard attachments sent from Outlook via email show up as winmail.dat file on user cell phones (iPhone and Android). <br />
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How do I send contact information from Outlook to users phones for them to open, view, and save into their existing contacts on their phones?
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vCard attachments sent from Outlook via email show up as winmail.dat file on user cell phones (iPhone and Android). 

How do I send contact information from Outlook to users phones for them to open, view, and save into their existing contacts on their phones?

vCard showing as winmail.dat on cell phones

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).

Android

The iPhone is a smartphone made by Apple Inc. It and the iPad, along with several other mobile devices from Apple, run on the iOS operating system, which has its own topic, as does the iPad for device-specific questions. Native iOS applications are written in Objective-C or in Swift using the Cocoa Touch frameworks or HTML5 compiled with the help of a package manager such as Adobe PhoneGap; a common IDE is Xcode.