[RCU] Migrate to Roundcube from OWMail

I am examining the features and benefits of roundbox webmail.

Since I have 7 years of mailboxes using OpenWebMail, another

webmail, I have to take the decision if it is worth to migrate to roundcube

now that I am contracting a different VPS with 1&1.

Two questions:

First, if my Sendmail mailserver OpenWebMail mailboxes contents

Inbox, Sentmail, etc, can be read by roundcube or not.

Second, compare the features of each one. OpenWebMail has tons of

features, webdisk, multilanguage, customization, etc. and so it seems roundcube,

Bottom line is there someone who knows OpenWebMail and can assist in comparing both

or how to migrate from OWMail towards Roundcube ?

I would appreciate any helping advice on this, please.

Pete