probl using [FAX:0,021234567]

Hi,
We use fax feature with Small Business Server 2003 and Outlook 2007.
We use to send fax using the address style [FAX:0,021234567] (we type it),
the "," stands for a pause when accessing an external line to send the fax.
It uses to work perfectly ...
Since 2 weeks now (windows/office update?) when Outlook validate this fax
address (underline of the address), it transforms the "," (coma) we typed by
a ";" (semicolumn) and the fax fail to be send. Then we edit the address in
the failed send fax and change the ";" by a "," and then it works.
Any suggestion about this wrong validation by Outlook?
Regards
Phm