Availability data caching in, meeting services is provided. In some examples, a list of users whose data is to be cached locally for a user may be determined based on factors such as their relevance to the user, a likelihood of a meeting being requested with the users, a history of common meetings, and similar factors. What type of user data to cache, for how long, at which granularity level, and similar parameters may be determined as well. User data for users from the list may be retrieved on-demand or on a regular basis from server associated with those users and stored at a server or other computing device for the user for fast access when the user requests to schedule a meeting.