Amy E. Baggott wrote:

I have several contacts from two companies that have just merged and
changed to a different company name and email domain. Is there any
way I can do some sort of "Find and Replace" function to change all
of them from their old company names and emails to the new ones, or
do I have to do them one by one?

Group your contacts by company and then drag the ones you want to change to
the appropriate group.
--
Brian Tillman