Searching the Global Address List (GAL) when query contains german umlauts äöüß

Hi,

we have a problem when searching the Global Address List regarding German umlauts (äöüß). Currently when someone searches for the name "Mueller", a person named "Müller" is not matched. I guess this is due to the active collation or sorting order, which is probably dictionary order. I want to use "German Phonebook order" DIN 5007 variant 2, as described here for example in the mysql documentation:

The latin1_german1_ci and latin1_german2_ci collations are based on the DIN-1 and DIN-2 standards, where DIN
stands for Deutsches Institut für Normung (the German equivalent of ANSI). DIN-1 is called the “dictionary
collation” and DIN-2 is called the “phone book collation.” For an example of the effect this has in
comparisons or when doing searches, see Section 10.1.7.8, “Examples of the Effect of Collation”.

    latin1_german1_ci (dictionary) rules:

    Ä = A
    Ö = O
    Ü = U
    ß = s

    latin1_german2_ci (phone-book) rules:

    Ä = AE
    Ö = OE
    Ü = UE
    ß = ss

How can this be achieved for Exchange/Outlook?

Thanks,

Tim