Microsoft has spent two years pushing Copilot as the answer to every AI question. For businesses already running on Microsoft 365, the pitch is compelling: it lives inside Outlook and Word, you get instant productivity gains, and it inherits your existing security and compliance.
But Copilot has hard limits. It only works in Microsoft apps. It cannot answer your phone, qualify a lead, book a customer, or run any workflow outside Microsoft 365. For most businesses, the question is not “Copilot or custom?” but “where does Copilot stop being enough?”
This page compares the two honestly. We will tell you when Copilot is enough, when it is not, and when a hybrid stack is the smartest answer.