As mentioned in the Contacts section, messaging is heavily integrated into the Sense experience. You can get to email and text conversations with people through their contact entry in the People app, but there are dedicated email and messaging apps.
Messages is a fairly straightforward text app, showing you an overview of the different people you've been texting on the main screen, with a threaded conversation view on offer if you tap on one.
To write a new text, just tap in the field at the bottom to bring up the on-screen keyboard. We've always been mightily impressed when it comes to writing messages on HTC's Sense range, including the original Desire and the HTC Desire HD, which is partly down to the excellent autocorrect.
We've always been fans of the HTC keyboard, and we're glad that the same thing is back in full force on the Sensation - we found accuracy much higher than that on the Samsung Galaxy S2 for instance, where the full stop kept getting in the way.
In landscape mode, this problem did creep in though, thanks to the size and dimensions of the screen. Another oddity: the 'I' sometimes decided not to capitalise when typing, but then would do so when you go back to it.
Words still take as long as before to save to the dictionary - it's only a fraction of a second, but it's still an annoying pause.
As is often the case, you have the choice of a Gmail app or a more generic Email app. The Gmail one is just as easy to set up as ever; if you have your Google account details, it's automatically set up.
The Email app also proved easy, offering an Exchange option and a generic POP/IMAP option initially. To set your POP/IMAP, you generally just have to put in your email address and password and the phone will do all the configuring for you.
Both email apps are very good, though HTC's Mail app fits in with the aesthetics and UI of the Desire S's other app better. It offers several ways to view your messages, including options to view your email as a straight up inbox, or as conversations.
You can also view email just from your favourite contacts, and this tab also enables you to address an email to all of your favourites with one tap.
There's an unread-only view, and also a screen that enables you to view only emails with attachments.
Writing emails uses the same keyboard as the messaging, so it's easy to write emails of a good length without getting frustrated.
When it comes to social network messaging, HTC's Friend Stream does a good job of bringing Facebook and Twitter together, but it isn't quite the complete messaging solution. It's more suited to fairly passive users who like to read others' statuses, lacking the depth you can go into for both social networks.
Basically, public replies on Twitter and Facebook status comments are in, but direct messages, trending topics and any other wider information is out - you'll need to download the official applications for that, which we would recommend as they integrate very well throughout the phone.