Why the outlook plugin case sensitivity?

I really love the new outlook plugin 2.1.0! Kudo's for the team!

But there's is one thing i really don't understand. Why is the check on the email adres case sensitive? Harold@dummyemail.com (Sugar) won't be found when the email in outlook is: harold@dummyemail.com

(Yes, it doesn't make sense to have a capital in the email adres, but i know this happens a lot)