It’s way less of a problem now than it was 20 years ago (at least in the Western countries I have services in my career) but it has traditionally also been an issue for a hard cutover of services, especially for SMB and even small enterprise businesses doing things like MX cutovers.
It’s way less of a problem now than it was 20 years ago (at least in the Western countries I have services in my career) but it has traditionally also been an issue for a hard cutover of services, especially for SMB and even small enterprise businesses doing things like MX cutovers.