Enterprise Portal 6.0 and IIS Webserver

Hi,

Our client is having a existing IIS webserver and going to implement Enterprise portal 6.0 and is planning to go for Apache Reverse proxy.

My doubts are ,

1. Is it possible to implement IIS webserver in the Enterprise portal System itself so that the existing webserver hardware can be used for implementing Apache Reverse Proxy. If possible what are all the drawbacks of it ?

2. Is the IIS webserver is compatible with Enterprise Portal 6.0 and Apache Reverse proxy ?

My advance thanks,

Regards,