If you want to add the add-in back, first need to uncheck the MyIC Outlook Addin and then click back 
AlcatelLucent Outlook2010 Extension. 
 
C:\Program Files\Alcatel-Lucent\My Instant Communicator\Extensions\Outlook\OutlookExtensions200.vst 
 
15.3.4 Exception when assignation UM mail box to user 
Symptom : when assigning UM mail box for exchange 2007 to user the 8770 generates an exception Remote 
exception from OT MS: Read timed out 
Diagnosis : the OpenTouch exchange account does not permit to access to user mail box 
You can check the OpenTouch exchange access password by browsing 
https://fqdnExchange/owa/<user@domaine.com> 
Login as icsaccess 
To get the icsaccess password : psql -U htuser CMS / select * from cmsmailserver ; 
Solution : ALL email account in exchange 2007 must be monitored (send as / full access) by your ICSaccess 
account