Software group Microsoft has reemerged as a corporate venturing investor by joining AppNexus' latest round.

AppNexus, a US-based maker of online advertising applications, has raised $50m in its series C round from software company Microsoft and venture capital firms.

Series C investors included all of AppNexus’ series B venture capital backers that invested $8m in September 2008: Venrock, Kodiak Venture Partners and First Round Capital. However, Khosla Ventures, which had been mentioned as an original investor in AppNexus, was not mentioned in this latest round of financing.

Microsoft has usually avoided public investment of corporate…

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