We are using OCS 2007R2 server with OCs clients. We are in the middle of migrating users to Office 365. We plan to deploy LYNC Online in the cloud after we migrate all the users. However we have noticed that after users get migrated to 365 they cans till use OCS but their Presence for going to meetings is gone. There is an Outlook integration error. We tried deploying Lync Basic to a few users already migrated to 365 but they get integration error as well. Lync Basic is pointing to OCS. Any ideas besides having to do Lync Online right now to get this configuration to work so users can Search for people and have presence?