I have my Confluence 3.5.3 installation connected to Active Directory and when I try for exmple to share a page with a user and start to write his name it sometimes completes correctly and sometimes not, dependent on the user. Has something to do with Icelandic letters.
For example
Writing Guðni it does not work, but what does work is writing Gudni which then searches for the username instead of full name.
But writing searching for some other names with Icelandic letters it seems to only manage to search in the lastname and middlename fields, but never in the firstname field.
So if someones name is Guðni Jónsson searching for Guðni would give no results but searching for Jónsson would work. If someones name is Jón Guðnason searching for Jón would give no results but searching for Guðnason would work.