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The new features being introduced in Outlook include the ability to send massive files, including hundreds of photos at a time, in a single email; address books that automatically update new contact information that connections post on Facebook, Twitter and LinkedIn; and about 60 percent fewer ads than Hotmail.

None of these features is revolutionary. Google already has been giving its users the option to switch to a new version of Gmail that also allows for larger files to be sent in a single email. And address books in Gmail already fetch new contact information posted on Google Plus, although it doesn’t yet mine Facebook, Twitter and LinkedIn.

Google declined to comment on Outlook.com. The company, which is based in Mountain View, Calif., plans to convert all of its Gmail users to its redesigned format within the next few months.

Yahoo, which is based in Sunnyvale, Calif., revamped its email service late last year in an effort to provide a more consistent experience on personal computers and mobile devices.

Outlook.com is the latest in a series of major product leases from Microsoft, which has been struggling to regain the cachet that once made it the world’s most valuable technology company.

Now, both Apple Inc. and Google are worth more because they have been growing far faster than Microsoft as their products win more fans. Apple’s biggest gains have come from the iPhone and IPad, while Google has been benefiting from its dominance in Internet search and its widely used Android software for mobile devices.

Microsoft has been trying to catch up with a major makeover of its Windows operating system, new smartphone software and a tablet computer called Surface. Like Outlook.com, all those products have been backed by expensive marketing campaigns in recent months.