MWI is not working for couple of users. Verified the CUCM configuration and able to turn-on and off the MWI from the phone. Reviewed the configuration and micro traces on the Unity and Unity is getting successful completion of MWI notification. I am also able to send notification to email but MWI just doesn't work for couple of users. It works for other users. All the users are using the same exchange server and same mailstore. Checked the switchID from the SQL and from the report and it's matching with the UTIM.
There is no conflict in the dial-plan in CUCM. CSS and MWI setting are correct. Changed the physical phones also. Running out of options.
Thank you in advance,