This has been a massive pain in the arse for me. I've done it in the past but I think Google may have changed something recently... I want to create a Google account and set up Google Calendar to receive invites for my personal non-gmail emails i.e. firstname.lastname@example.org I've set up a google and gmail account and added my alternative email (email@example.com) but when someone sends me a calendar invite to that email, even though I'm logged into to that account, it tells me I'm logged into the wrong account and it can't accept invites to that email. Anyway, the first answer that leads to me getting it to work I'll happily put $10 into your paypal account Thanks!