The Starbuck’ s logo is one of the most recognized brands in the entire world. Can’t you just picture it? Since introducing the brand in 1971, Starbucks has actually changed their logo over eight times. (According to Starbuck’s the lady in the logo is not a “mermaid”. She’s a “siren”–they have a slightly different job description…)
This is a good example of a logo that has adapted to changes over the years but still retains its brand recognition. You want to make sure a logo update doesn’t undo all the hard work you’ve put into creating an established brand.