Yahoo has improved its online calendar by adding easier to use functions.

A beta version of the calendar has been made available in the UK, US, Brazil, India and Taiwan. The search engine said global rollout will take place over the coming months.

Although Yahoo Calendar and Yahoo Mail are tightly integrated, only about 8.1 million use the calendar out of 278 million mail users, said John Kremer, Yahoo Mail vice president.

The situation is similar among other major providers of webmail and online calendar services, said Matt Cain, a Gartner analyst. Only about three to four percent of consumers also use their preferred webmail service's companion online calendar, he said.

There are various reasons for this, including continued use of paper-based calendars at home and of desktop calendar software like Outlook in the workplace, Cain said.

However, Gartner sees favourable conditions for significantly boosting the use of online calendars among consumers, from around 4 percent in 2008 to 25 percent in 2012, Cain said.

The factors that will drive up usage include increasing industry adoption of open standards that make online calendar services interoperable, he said. This is coupled with an increasing realisation among consumers of the benefits of subscribing to public calendars and sharing their online calendars with friends and family. In addition, younger users are all growing up using online calendars, he said.

"There's no question that online calendars will emerge as a very important part of portal collaboration software offerings for Yahoo, Microsoft, Google and AOL," Cain said.

"For anyone with a big email population, there's no doubt that the next big battleground will be at the calendar level," Cain said, adding that online calendars will become prime real estate for advertising.

Yahoo is hoping that the new Yahoo Calendar will prompt more Yahoo Mail subscribers to use it. Yahoo Calendar hasn't gotten a facelift of this magnitude in about 10 years, Kremer said.

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Yahoo has improved its online calendar which the search engine claims is easier to use and features added functions.

Among the features Yahoo is highlighting in the new calendar service is its compatibility with competing products from providers like Mozilla, Apple, Microsoft, AOL and Google.

This compatibility, which will allow Yahoo users to share calendar data with users of those other services, is possible because Yahoo Calendar is built on open standards like iCalendar (iCal) and CalDAV, Kremer said.

Yahoo hopes that open calendar standards are adopted broadly not only among online service providers but also among makers of business desktop and mobile calendar software, so that Yahoo Calendar will become interoperable with those products, Kremer said.

The new Yahoo Calendar allows items to be dragged-and-dropped into the calendar, as well as to be color-coded, and users will be able to call up calendar views as detailed as a single event and as broad as a month. The new Yahoo Calendar also has a 'to do' feature for listing pending tasks and the capability to set up reminder alerts that can be delivered via email, instant messaging or SMS.

Future versions of the new Yahoo Calendar will also sync up bi-directionally with Microsoft Outlook's calendar and let users access Yahoo Calendar when they're not connected to the internet via integration with Zimbra Desktop. The new Yahoo Calendar is based on technology from Zimbra, which Yahoo acquired last year.

In the future, Yahoo also plans to add further integration with other of its services, such as Yahoo Maps, so that users can call up a map from within the calendar, Kremer said.

Users will also be able to subscribe to receive events from public calendars and event services like Yahoo's own

The new Yahoo Calendar will also give third-party developers the chance to build applications and extensions for it via APIs and its standards-based architecture, Kremer said.

See also: Yahoo test new features and homepage overhaul

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