Significance of attribute names / alias

["John Lane" <listmail@oceanfree.net>]

I'm trying to put together a schema that works for both Outlook and Mozilla Thunderbird, as I haven't been able to find anything official or complete.

I'm hitting a problem with a few fields where the two apps expect different names.

For example, Outlook likes "URL" and Mozilla likes "workurl".

I have something like this in my schema:

attributetype ( 1.3.6.1.4.1.4203.666.100.124
        NAME ( 'URL' 'workUrl')
        EQUALITY caseIgnoreMatch
        SUP name )

If the NAME line is as above, Outlook can see the value, Mozilla can't.
If the NAME line is as below, Mozilla can see the value, Outlook can't.

        NAME ( 'workUrl' 'URL')

Is there a way to set up the attribute so that either name or alias is equally valuable in a look-up ?

Thanks,
John