Review: HTC Titan II for AT&T
The T2, as with all Windows Phones, manages communications and messaging quite well.
The email application plays nice with Exchange, Outlook, IMAP4, POP3, and other internet accounts with no problem. All you need are an email address and a password to get started. Of course, Microsoft wants you to have a Windows Live ID, which necessitates a Hotmail or other Microsoft email account. (You only need this if you want to sync/back-up your settings.)
The SMS/MMS app matches the capabilities of other platforms, offering threaded conversations and in-line embedded media. The SMS app is also used for the Windows Live IM service. Google Talk, Yahoo, and AIM aren't supported out of the box, so you'll have to go fish in the Marketplace.
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Social networks are integrated at the platform level. Since Facebook, Twitter, and LinkedIn are baked into the People Hub, you don't have to actually download and use dedicated apps for those services. You can do all the basics, such as post your status, read through direct messages, and see what other people are up to. It's all easy and seamless and works with but a few swipes and presses.
Beyond the native integration, you can of course use these social networks on their own. Facebook for Windows Phone is close to being on par with the client offered to Android and iOS devices. Twitter, on the other hand is a decrepit app that hasn't been updated since 2010. Yeah, 2010! It is slow, unreliable, and the user interface just doesn't get the job done.