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I don't know how the office 365 mailbox has anything to do with the phone system sending the message waiting indicator
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I don't know how the office 365 mailbox has anything to do with the phone system sending the message waiting indicator

Negash

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Microsoft Exchange server in a hybrid deployed with on-premise NEC phone system - message waiting indicator light (WMI) doesn't work on IP phones for users with Office 365 mailboxes. Any idea why this is happening and how to resolve it?
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Microsoft Exchange server in a hybrid deployed with on-premise NEC phone system - message waiting indicator light (WMI) doesn't work on IP phones for users with Office 365 mailboxes. Any idea why this is happening and how to resolve it?

message waiting indicator light

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.