Further, Windows Phone 8's icons are often unclear, and their labels hard to read. When you are using the More menu, the options Microsoft thinks you're less likely to use are displayed in readable text, but the ones it thinks you're more likely to use are displayed as harder-to-comprehend icons. That's really an issue of poor iconography, but it's emblematic of Windows Phone 8's UI flaws.
The Calendar app is a mix of good and bad. When creating events, you can invite attendees; specify the date, time, and duration; set an alert; add notes; and choose the calendar. For repeating events, you can set a variety of patterns such as every week, every Monday, or every 25th day of the month -- the same as Android. By comparison, iOS can't do patterns such as every Monday or every 25th day of the month. But you can't set a second alarm or specific the time zone for the appointment (Android and iOS can do both). However, only Windows Phone 8 lets you mark an appointment as private, so its contents aren't visible to others in shared calendars.
Where Calendar in Windows Phone 8 goes off the rails is in its views. There are two: agenda (the default) and month. Worse, when you switch to month view, there's no obvious way to shift back to agenda view -- you have to tap the physical Back key on the smartphone. iOS and Android support day and week views, and both make it easy to switch views via onscreen controls. Also, both iOS and Android show a scrollable agenda for the currently selected day, whereas Windows Phone 8 lacks this convenience.
The People app in Windows Phone 8 is its strongest suit for business users. The People app not only provides access to your contacts, it's also a hub for social updates from those people, letting you see in one combined location the tweets and posts from all your contacts, as well as the individual tweets and posts from any contact. People works largely as it did in Windows Phone 7.5, except now it has the notion of rooms, where you can create invitation-only groups for shared chats, notes, photos, and calendars -- a nice advancement. You can also create groups to monitor the social posts of certain members. My only beef with People is that the more contacts you have, the harder it is to navigate among them. There's no quick-jump capability as in iOS and Android; instead you have to use the app's search function.
Windows Phone 8, like its predecessors, includes a version of Microsoft Office, with Word, Excel, and PowerPoint document support in the Office app and synced note-taking in the OneNote app. They're all primitive.