The use of the semicolon and “conversely” is close, but not quite correct.
I’ll fix the semicolon problem first:
I find the proposed schedule to be very disagreeable; conversely, I am in agreement with Bob’s comments in his e-mail.
“Conversely” is an adverb that introduces a statement or idea that reverses one that has just been made. For instance:
I find the proposed schedule to be very disagreeable; conversely, it allowed more free time for our coworkers to intermingle.
Hope this helps!