Upgrade

new or better version of some hardware or software.

In Exchange Server documentation, "upgrade" is used in general references to describe an upgrade to a newer version of Microsoft Exchange software, including an in-place upgrade, a transition, or a migration. [Exchange 2007]

To change a MAC label or Information Label to a label that dominates the current label but is not equivalent to the current label [POSIX.6].

To move to a better accommodation or class of service.