That seems too simple. Why did they get so close to an acquisition if the VCs were steadfast against the sale? The TC article implies the Xobni team pulled out

That seems too simple. Why did they get so close to an acquisition if the VCs were steadfast against the sale? The TC article implies the Xobni team pulled out, over concerns about the product & team's future within Microsoft. If that's true, I'm confused as to why they built an Outlook plugin to begin with.