App store "update all" has old id on company device
We have a MacBook Pro owned by the company that was setup by a former employee who used their personal Hotmail address to login and register in the
App store. This employee is no longer with the company. I have removed the user name/Account from the MB since we didn't have his personal password. When I chose to update all apps I get a sign in request that shows his personal email address and I cannot edit it. I need to remove this address so it can be
managed from a company internal email address that will be used on this device to update it from this point forward.
How do I accomplish this?
MacBook Pro with Retina display, OS X Yosemite (10.10.4), null