Thanks for your suggestions. We have added your enquiry to the enhancement database for future review.
Please note, in GroupWise you can not easily access the Bithday field as the field type is reserved. The Personalized Emailer will not show the Bithday field in available fields list because of the field type. However, there is a work-around to access the Birthday field but we need to decide the particality to use the work-around in commercial solution which require to provide the GroupWise user name, password, etc.
We have reported this limitation to Novell some time ago and we will raise the issue again.
See the following thread about more information relate to the Birthday property: