Due to many requests to add Unified Messaging in Office 365 with Lync on Premises I introduce to you V1.1
V1.1 User Management of on Premises Lync Users with Unified Messaging either on premises, or in Office 365
How does it work?
On Premises 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
V220.127.116.11 includes managing UM in O365
Lync User Manager was introduced here