Auto complete does not work for Japanese user names on Connect Chat in IE11 for Jakarta Patch 5 and later releases.
Install the Japanese language plugin.
In IE11, start Connect Chat.
Press the + icon.
Copy and paste a Japanese user name in your instance (for example, 秀夫) in the TO field.
Note that the drop-down Japanese user name list does not show up.
Use Import XML to import the attached PRB1236615_workaround_JP5_fixed.xml XML file.