Q: How do I downgrade from 10.10.1 back 10.10.0? I cannot function at work without IMAP email accounts any longer......

Firstly I cannot believe Apple could release an OS with such a catastrophic effect on Mail.......

I have tried to work around it, but it just can't be done any longer, and with no sign of a fix anytime soon, I need to go back to 10.10.0...... and have never done this before.

Can someone help / advise please?

Thanks