It always seems to take me a little bit of time to find what I consider a 'normal' mouse - the most traditional shape/size is my preference.  
Also keyboards!  Does it not frustrate you sometimes?, if you prefer the most traditional one as I do - and many of them nowadays have made little critical changes willy nilly, expecting users to be OK with it.  I'm a speed typist, so anything that doesn't fit the traditional protocol makes a big difference to me, as muscle memory is what it's all about.  i.e. there needs to be a 6-button block with insert, home and page up.  there needs to be just 3 buttons on the far bottom left ctrl, windows, and alt - and so on and so forth.  
Oh the little things we get used to and dependent on, but Prabha I think your attachment to that mouse definitely wins the 'attachment' prize.  I do get attached to keyboards, so maybe I can kind of relate to you a little bit.