Click Start New Log Files on the Diagnostics Tool.
Test MWI by emptying a mailbox of new messages and then leave a new message for that person and wait a few minutes for it to fail. Note the time of the test.
After waiting to confirm failure, go back to the Diagnostic Tool and click the Gather Log Files, use the Select Logs option and pull the AvCsMgr, AvMsgStoreMonitorSvr, and AvNotifierMgr traces for the time of when you set the new logs. What you should look at first is in the AvMsgStoreMonitor and what you are looking for specifically is a statement TABLE_ROW for that user's alias you left a new message for. If you don't see a TABLE_ROW talking about ADDED for the alias of the user you left a new message for, then Exchange's MAPI is not sending any notification of any changes on that user's mailbox which is either a permissions problem mentioned by the previous person or MAPI is a problem. Besides permissions, you may want to refresh the mapi profile from Unity.
To refresh MAPI, go to the registry on Unity by going to Start > Run and typing regedit. Search the registry for Unity System Profile. Find the second instance and make sure under that Profile is a series of folders that have code names that are very long. Delete that whole Unity System Profile folder that has those long folder names in it. Reboot Unity and that registry will be recreated and refresh any corrupt mapi profiles Unity has for your partner Exchange.
Also use this troubleshooting guide readily available on cisco.com. You can search for Unity Troubleshooting Guide and find it pretty easily.
This is in response to the question about manually checking/adding permissions on the Exchange mailboxes/mailstore....
In Exchange System Manager, right click the top tier (the root, it's usually a domain name of some kind) and choose the Delegate Control option. Once Delegate Control is open, make sure that UnityInstall and UnityDirSvc are in there with the permissions mentioned in the pop up that comes up after running permissions wizard. Typically UnityDirSvc is read only and UnityInstall is Admin or Full Admin. UnityDirSvc can also be an admin but it depends on what you are going to do with users on Unity and how you are going to administer and/or add them. Again, refer to the html page the pops up after you run permissions wizard as it details that step in the process for Exchange permissions. If UnityMsgStoreSvc is in the delegate control, remove it as it doesn't belong in there at all.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
CUCM Database Replication is an area in which Cisco customers and
partners have asked for more in-depth training in being able to properly
assess a replication problem and potentially resolve an issue without
involving TAC. This document discusses the bas...