Having been developing Lotus Notes, then Lotus Domino apps for 14 years, this is basically too little too late. Sadly too many herberts associate Lotus Notes with a clunky email client that wasn't as 'slick' as other offerings back in the 90's and early 00's. Lotus, then IBM never showcased the really neat bits. Like saving the design change on a live server and having the VB dev sitting next to me ask when I was going to 'recompile it' :-)
IBM never drove Domino sales into the "less than 50 employees" market, never had a clear purchase path or easy to decipher pricing plan. One of the reasons MS is so ubiquitous is that you can buy their software so easliy.
As I'm being made redundant soon, my interest in IBM Domino is probably only going to be academic, but the shame is that, whilst it had it's problems, it was pretty adaptable and with the right mindset, very powerful for the money. However MS has always been better at marketing, and that is what wins market share. Changing the name won't make a difference unless IBM back it up with serious $$$ and £££