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Microsoft is boosting the amount of free storage space that Hotmail users receive to 5 GB. Paying Hotmail users will see their e-mail storage capacity, which costs $15 per year, grow from 4 GB to 10 GB. In contrast, Google currently provides 2.8 GB of free Gmail storage space and sells 6 GB of extra capacity for $20 per year.

When it comes to storage alone, Yahoo remains on top with its unlimited storage offering. But Microsoft is banking that its latest moves to rev-up the Windows Live Hotmail engine and give the service an edgy new dashboard will be enough to keep it ahead of the pack.

"Speed is one of the most important aspects of a Web-based e-mail service," wrote Microsoft Live Hotmail program manager Ellie Powers-Boyle in a recent blog. "We've spent more time in this release identifying what parts of the product are slowest and fixing those."

Makeover Highlights

Over the next few weeks, Microsoft will be pushing out its new Windows Live Hotmail offering to e-mail users in waves, so anyone who hasn't yet seen the new version can rest assured it will soon be coming their way.

One nice touch is Hotmail's new streamlined dashboard, which compresses the header so that more e-mails can be displayed on the page. The new format gives users the ability to automatically tell friends when they will be away on vacation, which has long been a prized feature of Outlook.

Hotmail now blocks images and links in e-mail messages from unknown senders, and provides a one-click way for users to report suspected phishing attacks. Moreover, a contacts de-duplication function is on tap to give users a one-click way to update information for anyone already listed as a contact.

Hotmail subscribers will be able to view their e-mail in either the new. Microsoft One-Ups Google with Hotmail Makeover

It's an issue that is costing search engine marketers millions of dollars each year. Click fraud is the act of repeatedly clicking an online advertiser's pay-per-click ad with sinister motives. Since the advertiser has to pay for each click the ad receives, fraudulent clicks can be very costly when foul play is involved. Take, for example, the competitive vendor who wants to bleed his rival's ad budget dry. Or, it could be an angry customer who is trying to get even with a merchant.

Whatever the motive, the costs can mount quickly when the intent is malicious. An estimated average of 14.6 percent of billable pay-per-clicks are fraudulent, according to Outsell Inc., an information industry research group. Outsell estimates that advertisers wasted over $800 million on click fraud in 2005. This nemesis of search engine marketing (SEM) has prompted nearly 30 percent of advertisers to stop spending on search-engine click-based initiatives, the firm reported, and losses to Google and Yahoo total more than $500 million to date.

So what is being done to stop the money drain? Web analytics vendors and software makers are running to the firing line with their own solutions designed to eliminate -- or at least curtail -- click fraudsters. But is it enough to get to the root of the issue, or will these money-motivated schemers find a way around the technology? What roles do search engine marketers and ad networks play?

The answers to those questions demonstrate that click fraud is a complicated issue that may mean the unwanted traffic is here to stay. Let's take a look.

Sources of Click Fraud

Techniques for click fraud fall into two broad categories: automated and user initiated, which we will discuss in a moment.

It is also important to point out that some unwanted clicks may come from spiders and robots. Battling Click Fraud One Click at a Time

Howard Hughes Medical Institute researchers have developed a small molecule that can turn the survival signal for a variety of cancer cells into a death signal. The molecule mimics the activity of Smac, a protein that triggers the suicide of some typ. Synthetic Molecule Makes Cancer Cells Commit Suicide