I have been noticing that Exchange-based meeting invites sent to you are not received on iPhone. I believe it’s because IMAP is for email and can’t deal with the calendar protocol in exchange. It’s not made for that. I cannot accept or reject an incoming meeting invite from the iPhone mail client. (This doesn’t effect meetings I schedule myself obviously). My workaround is to check Outlook Web Access periodically where I can accept/reject mtgs.
Source: Bijan Blog
A big pain for me! Will Microsoft get off their ass and add exchange support before RIM does.
Well the time has come to start my personal blog. Wikipedia defines the word blog, a place to provide commentary or news on a particular subject, such as food, politics, or local news; some function as more personal online diaries. For me this will be a place where I share my experiences with all of you on what is involved behind the scenes of running my website 
Another biggie for myself. Even though I use a personal exchange server for my own email/Outlook, I frequently forward or add my personal email to meeting invites and then accept them when they come via outlook on my device.