Voice messages appear as unread until they are accessed over the phone or are marked as read in your email client. The message waiting indicator (MWI) light on your desk phone remains switched on as long as one or more voice messages in your Messaging Inbox are marked as Unread. The MWI light is turned off when all voice messages in your Inbox are marked as Read.
If you skip a message by pressing # before ten seconds of message playback has elapsed, the message remains marked as Unread and the MWI lamp remains switched on.
If you skip a message by pressing # after ten seconds of message playback has elapsed, the message is marked as Read.
From Messaging 6.1 Service Pack 1 onwards, if you save a message, it is marked as Read even if the message played back for less than ten seconds.
As soon as you start reviewing a message, it is marked as Read.
From Messaging 6.1 Service Pack 1 onwards, if you save a message, it is marked as Read even if the message played back for less than ten seconds.
If Outlook is in cached mode when you delete a message, the MWI light switches off only after the next synchronization between Outlook and Exchange .The MWI light is switched off when there is any change in Outlook that influences the MWI, such as read or unread status change, deletion of a message, or moving a message to another folder.