I have been using Pair Networks for several years and agree with a lot the the above positive comments. However, I have had serious email issues that have not been resolved. Business emails have not been sent nor received and I was not notified. I was informed when clients told me they have sent emails &/or they have not received, you just can not conduct business like this. Pair Networks is aware of the problem that have with SquirrelMail and I am now waiting to hear back from them.
So if you are using their webmail you may want to double check important emails you have sent.