Client has two companies under one roof, on one domain. Recently went to Office365 but did it as two tenants due to billing separation and purchased two separate office 365 business accounts, but have a handful of employees on both tenants. All users using the one Exchange 2013 and one Lync 2013 Environment with @company.com emailaddress. They're using Lync and room resources in Exchange for their conference rooms. I would like to get them on Lync online, using room resources and syncing passwords with AADSync.
Both Company's want to keeps there own tenants, reason because of the simple math involving splitting the subscriptions and administration,
Everyone would be on one Lync. Unless there is a way to integrate Office365 Lync Tenants as I've read that AADSync can work with one domain and two tenants by using two Sync servers.
In the end the requirement of the migration is that users should have one Outlook profile and one email-address if the tenants should be merged.
Looking for best list of pros/cons for merging and not merging along with easiest merge method.