The logo is no longer "modern", it's no longer up to date. Maybe the company was restructured, sold, or has opened new business segments.
The logo is misinterpreted, wasn't well received (or not at all) by the customers.
All of the above, and the following reasons can make the modernization of a logo necessary.
Subpages concerning "Reasons for Modernization":
When social values change, it is important for newly founded companies - and also for renowned companies - to check their brand strategy ...
In companies, there's a constant change of things. New products may be added to the range, or new business segments may be opened.
Over time, the originally designed logo may fail to meet all of the technical requirements.
You may know this effect from recent TV-shows: If one broadcast station airs a new show that kicks in well, it is promptly copied, a very similar concept is cre...
Generally, the more simple a logo is, the better people can keep it in mind. That makes me think of a saying that i found in an internet forum once. Unfortunate...
In logo design, you should also pay attention to multinationality. In other cultures / countries, certain images and words have completely different meanings.