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What can we tell you? First, it's old. Second, it's a business projector, not a theater projector. Christie may be a famous brand for cinema and large-scale presentations, but that doesn't mean all their stuff is by-and-large the best quality.
If it has a new bulb it's likely quite bright. I'd tweak the color settings to make sure it shoots out a relatively balanced image and then use it for, like you said, business stuff. I think it will do all those things you mention, but probably not very well or any better than current low end business projectors. I'm not saying it's a bad projector, but I'd be skeptical to use it at client events if they're expecting a really great image.
Strengths: brightness, optical quality (assuming it follows Christie's reputation), size (compact is good for portability)
Weaknesses: old tech, no warranty, size (prohibits lots of fancy processing to go on), maintenance (DLP's are higher maintenance than LCD's), resolution (not even 1080p), connectivity (no HDMI), black level, brightness (won't be bright enough for large-venue screens with ambient light, certainly not outdoors)