Deal is latest in a string of agreements Microsoft has struck with holding companies.
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Previewing the new site for users and advertisers allows them to make suggestions prior to the formal launch, according to AccuWeather.
Company had a record quarter, no thanks to display and search sales.
Creative agency will leverage social media. Media will be handled by OMD and Resolution Media.
CEO Bartz seeks to bolster display ad business after Q4 decline in search revenue.