Roundcube on multiple domains

[Legs]

Can I start by saying im really sorry for this question, I imagine it is blindingly obvious however my only experience with Roundcube has been using it pre-installed through cPanel.
I manage multiple domains and I would ideally like to install Roundcube on one and have all my customers access that install for their webmail needs for their various domains.
Is this possible or do I need an install on every domain?

Many thanks

Legs

[SKaero]

You can definitely do it. One word of warring if your using cPanel and all the sites are in different cPanel accounts on the same server as you want to install RoundCube you'll need access to WHM to change ownership of the subdomains to the account that as RoundCube.