Conflicts w/ IIS, MySQL, SQLExpress?

I’m considering installing openfire on a Windows 2003 R2 Server already running IIS, MySQL (small intranet db), SQL Express (Workgroupshare database), Active Directory, and IMAIL Server.

(Using Openfire to replace IPSwitch IM which hasnt seen an update in years).

We’re a small organization of about 40-50 users. Server hardware can definately handle it.

I was intending to use the database that comes with Openfire. Am I pushing it trying to run too much on this machine?