I’m developing a training app for the company I work for and we need a way
to install it on employees devices. Is it possible to install from a
corporate server?

Depends on the details of what you really mean by "install from a corporate
server".

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TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
transit tracking app for Android-powered devices

1) Upload APK to the internal servers
2) Instruct all employee to download and install it by direct link to the
apk file if they have "*Unknown Sources"* checkbox enabled

If your company is larger and is planning on developing more in-house app
for its employees  (and customers?), then something like the EASE platform
of Apperian may be of interest:
http://www.apperian.com/get-started/ease-platform/

What you ask for is called "sideloading".

On Aug 6, 4:39 pm, Jonathan S <xfsuno...@gmail.com> wrote:

There's a few more steps:
3) Add the following MIME type to your web server(s):
application/vnd.android.package-archive
to go with the .apk file type
4 a) If your users are in a BYOD situation: Have an answer for users
who bought devices from a carrier/vendor that doesn't support
sideloading. For example, send them back to the carrier/vendor to have
it enabled, which of course doesn't happen. What ever you do, don't
make it your problem.
4 b) If you get to decide which devices are purchased, make sure your
vendor(s)/service provider(s) support sideloading. Have multiple
vendors lined up in case one has a change of heart so you can switch
quickly.