Due to many requests to add Unified Messaging in Office 365 with Lync on Premise I introduce to you V1.1
V1.1 User Management of on Premise Lync Users with Unified Messaging either on premise, or in Office 365
How does it work?
On Premise UM
Known Limitation –
You still need to enable a O365 user for UM in the Exchange Control Panel within Office365 (for now). Looking into it
V126.96.36.199 includes managing UM in O365
Lync User Manager was introduced here