From an e-mail today:

I was just in a Microsoft presentation where our company's decision makers were told that the Microsoft share in email has grown from 52% to 86% here in the [sub-region of the USA], and that while companies are constantly converting "from Notes to Exchange" there has never been a conversion in the other direction.
My response:

1) Microsoft actually lost share in 2006 on a worldwide basis according to IDC; both vendors have more than 40% of the market but less than 50%.
2) No analyst that I've ever seen tracks messaging share on a sub-region basis in the US.  I'm not even sure how they'd do it.
3) See lotus.com/compare for some public examples of conversions from Exchange to Notes, and remember the big ones that have been publicly identified over the years.

I also was surprised that the decision makers at this Notes shop took Microsoft's lie at face value.

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