Setting up Exchange access on both devices was also simple. However, Windows Phone 7's lack of support for on-device encryption meant that InfoWorld's Exchange server wouldn't let it connect, as one of our three Exchange ActiveSync (EAS) policies requires on-device encryption; thus, I can't tell you how Windows Phone 7 works with Exchange email, calendars, or contacts, as I can't access them. Given how basic a requirement on-device encryption is for enterprise security, Windows Phone 7 simply can't be relied on in a business context. (And using Webmail is no fix; the Webmail screen is simply torturous to navigate in Windows Phone 7's IE7 browser.
Basic email functions. Working with emails is easy on both devices. You can reply, forward, mark as unread, delete, and move messages while reading them. In Windows Phone 7, you need to tap the more (...) button to see some options; on the iPhone, some options are in the message body itself. On both systems, you can easily delete individual messages from the email list: Swipe to the left and tap Delete on the iPhone, or tap and hold the message header, then tap Delete in Windows Phone 7.
Both the iPhone and Windows Phone 7 let you search emails, but Windows Phone 7 isn't as good at it. It searches only the current folder, whereas the iPhone searches all your email. The iPhone lets you refine your search or your email list's display by From, To, and Subject fields (as well as All); Window Phone 7 does not.
Getting to the top of your email list isn't so obvious in either. In the iPhone, tap the top of the screen. In Windows Phone 7, slide over to unread or urgent messages, then back to all. Neither has a quick-jump shortcut to go to the bottom of your list.
Email management. Windows Phone 7 displays emails in a simple list for each account you have; they appear as separate panels -- app icons, essentially -- on the home screen. But you can't see all emails from multiple accounts in one view, as you can on an iPhone.
Navigating emails is easy on both Windows Phone 7 and the iPhone, and Windows Phone 7 has copied the iPhone's approach to moving and deleting messages in the list: Tap Edit, select the messages, then tap Delete or Move. Windows Phone 7 has a neat capability unmatched in the iPhone in which you slide your email list to the side to see just unread messages; slide it again to see urgent messages; and one more time to return to all messages.
Windows Phone 7 adds an unnecessary step when you want to view your email folders. When you tap the Folders button, you get a screen with two options: Inbox and Show All Folders. (If you're in a folder, you also get the current folder name in the list.) You have to click twice to see your folders. The iPhone lets you tap an email account to go straight to its folder list, though you have to use the second accounts list in its Mail app; the first list brings you to just their inboxes. Both operating systems could do better in terms of folder access.
Windows Phone 7 does not automatically sync mail folders with the server when you open them, as the iPhone does. And the iPhone lets you set in its preferences which folders you want autosynced; Windows Phone 7 can't do that.
The iPhone 4 has a message threading capability, which organizes your emails based on subject; you click an icon to the left of a message header to see the related messages. That adds more clicking to go through messages, but it also removes the effort of finding the messages in the first place. (iOS 4 lets you disable threading if you don't like it.) Windows Phone 7 has no equivalent.
I was annoyed that Windows Phone 7 doesn't support PDF files out of the box; you have to download the Adobe Reader app from the Windows Phone Marketplace. It does open images and Office files, though, after a two-step process of downloading the attachment, then opening it (tap and hold each time). The iPhone's built-in QuickLook viewer handles a nice range of formats, and it opens attachments with one tap, downloading them if needed at the same time. But the iPhone doesn't open zip files, whereas Windows Phone 7 does.
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