It's been about a year now since I kicked my outlook email habit and been a gmail and google calendar user. There are two things that I miss. In gmail, I wish I could sort my inbox by subject line or user. I really really miss that feature and it helped me clean up my email quickly. The second thing I missed was having my calendar and sync ability with my pda/cell phone (treo). I relied on the mobile version and if I couldn't get online was screwed.
Google has recently launched this feature and I thought this is worth hauling out OutLook so I can sync my calendar, keep it on my desktop and sync with my treo. No glitches. Glad this is back.
You can download the app here.