I'm considering starting to pay for Zoho email hosting.

I've got several 'free' accounts but not being a 'tech' minded person I waste too much time getting zoho setup done.

SO - I'd like to know - 

Q#1) with  PAID accounts -  how 'responsive' Zoho their SUPPORT department is.

Q#2) How many Domains can I integrate into one paid email hosting account (so when i email my customers - MY domain shows up - not zoho's)

Q#3) How well does Zoho work with SHOPIFY? Seems impossible to set MX records up...

Q#4) How difficult is it to migrate my multiple zoho email accounts into one paid account?

THANKS for contributing,

John