Must be something in the air. Last week, there was news Microsoft is planning a new fall conference in Fargo, N.D. This week, there's a speculation Tami Reller will leave Microsoft. And now, just as Microsoft Convergence is ready to kick off, comes the appointment of Doug Burgum, former president of Great Plains Software and former head of Microsoft Business Solutions, to the board of directors of Avalara. Besides his role in accounting software, Burgum is a founding partner of Arthur Ventures, a Fargo-based venture capital firm focused on software companies.