IMPORTANT WARNING FOR UK2 USERS
I'm a UK2 user (suffering on for the moment - I have too many domains to move at the mo) - and I've been observing this "mail migration" today.
They seem to be moving the UK2 mail content TO THE USA: the main mail.uk2.net mailserver is now reporting (as of today) a new target IP address [216.40.42.128] in North America, and the HTTPS certificate reports "wrong target site" in Firefox when the webmail client is used.
I think they're badging a discounted Webmail client service from the US: 216.40.42.128 reverse-checks as a company called "HostedEmail.com". And if you look under the bonnet of the Webmail pages, there are "branding" codes evident in the URLs.
I'm not sure if I like having my email text sitting out in the USA : I've put in a query via the ticket system. Who agrees with me ? Do tell them if you're not happy with this.