Hi,
we use some old concept that dates to the dark ages where we have a Public Folder, and there we have like a phone contact list from all of our employees. This list must be manually copied into our own outlook365 client, and only then will this be synced on our mobile phones (Android & iOS).
However, when one employee leave the company, nobody deletes him/her from the outlook address book, they stay there for ever.
How did you guys solve this? What software are you using? Can it be done over O365 somehow?
Cheers!
If yes, go to this GAL and see if you can search those users that you needed to sync.