Invariant Culture User Search
When searching for users the search should be in an invariant culture. Since there are many ways to type a name in different regions it's very uncomfortable having to find the correct spelling for a name. Ej. "José" should be a result for search "Jose" as I don't know if the name has a mark or not or whether it was even created correctly in Active Directory.
Slobodan Dan commented
This is especially frustrating when you are communicating with people outside your country - I can't have five different keyboard setups just so that I could search for a person that has a name starting with "Á".