Voice Mail Message Waiting Indicator (Exchange 2010) does not work

Problem: for the user Message Waiting Indicator does not work - does not get lighten up when the voice mail is left.

Resolution:

1. Make sure that Outlook is running in online mode (Not Cached Exchange Mode).  In online mode Outlook will say "Online with Microsoft Exchange" in the status bar, not "Connected with Microsoft Exchange".
2. Delete the Voice Mail search folder in Outlook.  This only deletes the search folder, not the messages.
3. Dial into Outlook Voice Access to access your old voicemails.  You need to enter the "voice mail" command, even if OVA says you have no new voicemails.  When you do this, EWS will recreate the Voice Mail search folder in Outlook.  Hang up.
4. Reconfigure Outlook to use Cached Exchange Mode again and restart Outlook.  Since the OST header still matches the mailbox database header, Outlook will use the same OST and will resync your emails quickly and easily.

Reference article: http://www.expta.com/2012/01/how-to-reset-exchange-2010-mwi.html

Disabling Operator ("0") option for Exchange Mailbox

Default Option when creating UM Dial Plan  in Exchange 2010 is to have "Operator extension" is set to 0 (UM Dial Plans/Properties/Settings)

If you need to disable operator for certain mailboxes (users) here is the list of steps to follow:

1. On Exchange: create the new UM Dial Plan - make sure that "Operator extension" is set to empty (UM Dial Plans/Properties/Settings) - name the new UM Plan to something like "4-Digit No Operator".
2. Set "Subscriber Access" extension on the new UM Plan: (UM Dial Plans/Properties/Subscriber Access).
3. Create new Hunt Groups for every IP Gateway (UM IP Gateways tab), make sure to use the new UM Dial Plan and Pilot Identifier set in step 2 for subscriber access.
4. Disable Unified Messaging for the user/Enable Unified Messaging specifying new UM Dial Plan during enabling process.  That concludes Exchange portion of configuration.
5. On PBX: configure PBX to call new subscriber access (set in the step #2) for the user/users that should have operator option disabled.
6. On IP Gateway: make sure that subscriber access extension (set in step #2) is in the scope of extension that target Exchange UM.