Updated behavior for browsing large online address books

Microsoft has made changes to improve the performance of browsing online address books in Exchange Online. This change affects online address lists with more than 500 objects, including the Default Global Address List, built-in address lists, and custom address lists, but does not affect browsing Offline Address Books. From now on, when browsing an online address book in Outlook, only the first 500 users are shown if the result set exceeds 500 objects and users are encouraged to use the existing search functionality to find specific users or sets of users with similar names. The behavior when searching based on "All columns" is unchanged, but search results are not displayed if the result set exceeds 5000 objects and a message encourages users to narrow their search criteria. Searches based on "Name Only" now behave consistently with searches based on All columns and no longer allow unlimited browsing of the entire address list. Microsoft recommends users rely on search and inform end users of the new behavior.

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