Hi All.

I'm currently shopping around for an outsourced webmail provider based in the UK. Can anyone recommend a company or two?

I'm looking for:

Linux backend / servers.
SSL (fully secure is preferred, but secure login is acceptable)
Antivirus and sensible spam filtering.
Browser-agnostic interface - skinnable interface is a bonus.
Approx 2,000 IMAP mailboxes.
Ability to manage the webmail (create users, enforce quotas, filters etc).
Experience of bulk-converting Exchange 5.5 (yeah I know) mailboxes --> Linux a major bonus.
Proven, reliable company.

I'm currently looking at a system from Netmedia

I have looked at rolling out Horde in-house - though I'd love to do it I have far too many balls in the air as it is.

Thanks

Pete