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I guess I'm too old and ingrained in my telephone / e-mail ways, not having grown up with IM tools. TR members have offered a few examples, but none of them apply to how I work.

We use MS Communicator and will be upgrading to Lync this summer. I'm not opposed to this class of tools in general (other than what appears to be a universal lack of a spell checker), but I just don't get why someone would rather type than talk.