Yahoo has screwed up Calendar, Contact, My Yahoo, and others. See Ya after 20 years
Yahoo Calendar and Contacts are a mess. After 20 years I am migrating away to a system that works.
Sad to leave as Yahoo use to cover everything well. It has become totally unmanageable.
Yahoo is finally doomed to lose most all of its customer base.
Nazmul Haque commented
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Yahoo, feel free to reach out and find out what you're doing wrong. As a long time customer I hate to leave but you have screwed up all of your apps