iPhone app

Hey everyone,

My general manager just got himself an iPhone last week. We don’t currently host an Exchange server. We use a hosted POP server for our email. What I am looking for is an app that will allow him to accept calendar invitations from his phone. From what I’ve read so far, the iPhone will do it if we have an Exchange server in place, but that’s not the case.

Any help would be appreciated.

Thanks in advance.