By Steven Norton 

Starwood Hotels & Resorts Worldwide Inc. relocated to a new headquarters in Stamford, Conn. a few years ago. That gave CEO Frits van Paasschen a chance to get rid of some clutter.

The first thing to go? His desktop computer. "I thought, you know what, I actually don't use it," he said. Instead, he chose to go all mobile. "I do all of my work via mobile so essentially my office is wherever I go, and I can be much more productive."

Mr. van Paasschen, 53 years old, is among a growing number of professionals to enter the post-PC world, ditching the desktop and turning to smartphones and tablets as primary work tools. The former Coors Brewing Co. chief relies on his Apple Inc. iPhone and iPad for work both at home and the office.

He admits that the transition was easier for him than for the average employee, since he spends the bulk of his time traveling, attending meetings, or reviewing documents others have created. But he is an early adopter, not a fluke.

As mobile devices get faster and add new capabilities, the chained-to-your-desk PC may begin to fade. Research firm Gartner Inc. projected in July that the traditional PC market, both desktops and laptops, was on pace to shrink 6.7% this year, and 5.3% in 2015, based on the number of units shipped. Tablets and smartphones, on the other hand, are expected to grow.

Eli Lilly & Co., for example, transitioned its entire sales team away from laptops over the past few years, deploying 18,000 iPads to help improve the way salespeople interact with busy doctors. Mike Meadows, Lilly's vice president and chief technology officer, said the switch boosted productivity since the salespeople no longer had to fumble with bulky computers and poor battery life.

At Starwood, Mr. van Paasschen's office doesn't have a real desk, or the tangle of wires that comes with a typical PC setup. Instead, the room sports a couch and a conference-style table with some built-in power outlets. His real office might as well be the black bag he carries with him, which contains his iPad, keyboard and a large plastic container for chargers.

The Dutch-born Mr. van Paasschen says the mobile shift, paired with a hectic travel schedule, puts him in the shoes of the hotel operator's primary customers: digitally savvy business travelers who expect to be connected wherever they go.

Mr. van Paasschen's working day revolves around mobile, even when he's not on the road. In the morning, he wakes to his iPhone alarm, sends a few texts, then heads to the gym in his basement. There, he whips out his iPad to catch a TED talk or Netflix documentary between reps. The tablet also joins him at breakfast, where he "reads the paper" using mobile apps like Zite and Flipboard before getting back to email and heading to work. After work, he often finds himself on his phone playing Letterpress, Scrabble or Sudoku.

He's started texting more, his colleagues say, and he will occasionally conduct a performance review via Google Hangouts or FaceTime, Apple's videoconferencing application. When visiting a property in Portland, Ore., a "luxury soap dispenser" became fodder for a quick photo to his chief brand officer.

Meanwhile, mobile apps at Starwood have moved beyond standard productivity tools like email and now include core enterprise apps built specially for mobile usage. The hotel operator's new "Room Cataloguing" mobile app, built for global hotel associates who are usually on their feet helping guests, references 12 million data points about hotel rooms around the world, such as whether a room is close to an elevator, or has a full-length mirror.

That data gets filed in a Starwood global reservation system. Now, if a guest wants that full-length mirror, Starwood can quickly match them to the right room. It's that agility, Mr. van Paasschen says, that will pay dividends to Starwood, whose brands include Westin, Sheraton, W Hotels and St. Regis. "The system also gives time back to the associates so they can spend more time actually responding to guests' needs."

Mobile has also boosted productivity, he said. Meetings at Starwood are paperless, emails are shorter, and Mr. van Paasschen won't open bulky spreadsheets. "When I get the massive file, the first thing I'll do is send it back and say tell me the key points that I actually need to understand."

Chris Holdren, global SVP of Starwood Preferred Guest and Digital, has taken a note from his boss. His laptop permanently resides in his New York City office. His iPad and iPhone keep him connected during the two-and-a-half-hour commute to work each day, and he no longer needs a PC to work on presentations. "Now I just use my iPad."

To be sure, mobile isn't a magic bullet yet. Mr. van Paasschen admits that his travel-heavy schedule makes it easier to ditch the PC.

"You can work and dress and use technology in the way that most suits you, and I think that ultimately the result of that is that we're all more productive," Mr. van Paasschen said.

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