If one wants to understand why Infosys Ltd's (INFY) shares are down over 7% in response to news CEO Vishal Sikka is resigning, a good place to start would be the lengthy Knowledge@Wharton interview he gave in March.

There, Sikka talked at length about his attempts to shake up Infosys' culture as the Indian IT outsourcing giant deals with intensifying competition and some big secular challenges. He talked about Infosys' Zero Distance initiative, which prods every software team at the company to "do something innovative" with a project, as well as its Design Thinking initiative, which aims to improve the problem-solving abilities of workers. And about his attempts to differentiate Infosys' offerings via investments in areas such as AI/machine learning and automated IT services.

Sikka's departure doesn't necessarily spell an end to these efforts. But it does introduce a big dose of uncertainty, especially since the circumstances surrounding his exit pave the way for a bitter fight between Infosys' board and its founders.

In a letter to Infosys' board announcing his resignation, Sikka, originally appointed in 2014, asserts he and the board have been "besieged by false, baseless, malicious and increasingly personal attacks" that have "been repeatedly proven false and baseless by multiple independent investigations." He adds this "continuous drumbeat of distractions and negativity" has impacted his attempts to remake Infosys, and that "hundreds of hours" of his time have been recently devoted to dealing with it.

The remarks are a reference to criticism of Sikka by Infosys' founders, including chairman Narayana Murthy. The founders, who collectively still own 12.75% of Infosys, had previously questioned Sikka's compensation, as well as that of COO Pravin Rao (now Infosys' interim CEO). In a July letter to the board that Murthy released following Sikka's resignation, he raised perceived governance problems surrounding Infosys' $200 million 2015 purchase of Panaya, an Israeli provider of testing and quality-management tools for enterprise apps.

A whistleblower had alleged Infosys overpaid for Panaya and suggested some Infosys execs may have financially benefited from the deal, which was opposed by now-departed CFO Rajiv Bansal. However, a probe of the deal led by law firm Gibson Dunn had cleared Infosys of wrongdoing in June. In his letter, Murthy insists he's not questioning "[Sikka's] strategy or its execution," and is only worried about governance. But Murthy is also reported to have sent an e-mail quoting some Infosys directors as saying Sikka is "CTO material" rather than "CEO material."

This morning, Infosys' board released a strongly-worded statement defending Sikka's track record and asserting Murthy's letter "contains factual inaccuracies, already-disproved rumours, and statements extracted out of context" from conversations with directors. It adds "dialogues" with Murthy over the last year that were meant to legally address his concerns without compromising the board's independence have been unsuccessful.

The board also accuses Murthy of threatening to publicly attack the board unless it carries out "certain changes in policy," "[appoints] specific individuals" and carries out "operational and management changes." It also declares Murthy might be in the process of holding talks with "certain key [Infosys] stakeholders" to further his attacks on the board and management. Needless to say, this dispute is shaping up to be a messy one.

Cultural differences appear to have played a role in the falling out between Sikka and Infosys' founders. Though born in India, Sikka went to college in the U.S., worked for several American software firms and later joined German software giant SAP, where he eventually became CTO. In dress and demeanor, his style contrasted with that of Infosys' original management. And while Infosys' headquarters remain in the Indian city of Bengaluru, Sikka and the company's "Office of the CEO" were stationed in Silicon Valley.

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