Bring Your Own Devices

An acronym I have just learned: BYOD, bring your own devices.  The policy of companies allowing employees to use their own devices for internal use.   The practice and the policy has been tested formally and informally used for some time.  We tested it actively for a decade.  Now that companies like MS are planning to provide full office packages for the popular tablet format, it is likely to become even more common.  What are the implications for MS and the idea?