Of, relating to, or being a previous or outdated computer system

Of or pertaining to documents, data, or hardware that existed prior to a certain time. The designation refers particularly to a change in process or technique that requires translating old data files to a new system.

ETYM Latin (assumed) legatia, for legatum, from legare to appoint by last will, to bequeath as a legacy, to depute: cf. Old Fren. legat legacy. Related to Legate.
1. A gift left to one's descendants.
2. A gift or standard left to those who remain after one leaves.
In law, a gift of personal property made by a testator in a will and transferred on the testator’s death to the legatee. Specific legacies are definite named objects; a general legacy is a sum of money or item not specially identified; a residuary legacy is all the remainder of the deceased’s personal estate after debts have been paid and the other legacies have been distributed.