No matter where you are, you can access your office mail and that too without getting registered for! .Yes. www.mail2web.com offers this service. You just have to give your mail id and your password and your latest mails are there for you to display. Keep in mind, it shows only new mails and not all your mails that are there in your office desktop hard disk. Meaning, if you are storing your mails on the server then you can have all the mails, otherwise, only those mails which are not yet moved to your personal folders you can see.
It's a free service and the good thing is you don;t have to register yourself. As most of the consultants will have different mail id's, they can easily access their mail box from this site!.
Ofcourse there are some paid services also.
So check out... when you are travelling, never mind your mail is with you.