Running BI7 and BW 3.5 on the same system

Dear All,

We have a BW 3.5 already running. Now the client wants to go for BI7 and wanted to evaluate the possibility of having BI7 and BW3.5 on the same server. If anybody come across this situation, please let me know the risks involved in having two bw versions on a single host.

Regards

vijay