Integration is only supported with the fully installed Outlook client and not the OWA client. Outlook Microsoft Store edition is not supported.
If the integration supports caching, please note that cached integrations support up to 30,000 contacts. The live mode method would need to be used for larger directories. Performance will then be determined by a number of additional factors including network speed and application API specification.
This tool is only available for Windows 7/8/10. There are no plans to create a Mac or Linux version.