Question: What was the official communication including over 100 emails which contained classified information which was investigated by the 7th director of the Federal Bureau of Investigation?

In March 2015, it became publicly known that Hillary Clinton, during her tenure as United States Secretary of State, had used her family's private email server for official communications, rather than official State Department email accounts maintained on federal secure servers.  Those official communications included over 100 emails which contained classified information at the time they were sent, as well as nearly 2,100 emails which were not marked classified but would retroactively be ranked as classified by the State Department. <SEP> The National Security Higher Education Advisory Board (NSHEAB) was created by American Federal Bureau of Investigation (FBI) Director Robert S. Mueller III on December 15, 2005.  Operated by the FBI and paneled by approximately 20 American university presidents and chancellors, the expressed purpose of the board is "to foster outreach and to promote understanding between higher education and the Federal Bureau of Investigation."  The board also facilitates communication between universities and federal authorities on "national priorities pertaining to terrorism, counterintelligence, and homeland security."  NSHEAB meets approximately three times yearly and includes representatives from the Central Intelligence Agency and other security agencies. <SEP> During the 2007 Congressional investigation of the dismissal of eight U.S. attorneys, it was discovered that administration officials had been using a private Internet domain, called gwb43.com, owned by and hosted on an email server run by the Republican National Committee, for various official communications.  The domain name is an abbreviation for "George W. Bush, 43rd" President of the United States.  The use of this email domain became public when it was discovered that J. Scott Jennings, the White House's deputy director of political affairs, was using a gwb43.com email address to discuss the firing of the U.S. attorney for Arkansas.  Communications by federal employees were also found on georgewbush.com (registered to "Bush-Cheney '04, Inc.") and rnchq.org (registered to "Republican National Committee").  Congressional requests for administration documents while investigating the dismissals of the U.S. attorneys required the Bush administration to reveal that not all internal White House emails were available.  Conducting governmental business in this manner is a possible violation of the Presidential Records Act of 1978.  Over 5 million emails may have been lost.  Greg Palast claims to have come up with 500 of the Karl Rove emails, leading to damaging allegations.  In 2009, it was announced that as many as 22 million emails may have been lost. <SEP>  Comey had been under public and political pressure as a result of both the FBI's role in the Hillary Clinton email controversy and the FBI's investigation of Russian interference in the 2016 U.S. elections, which also involves a possible collusion with the 2016 Donald Trump campaign. James Comey, the 7th director of the Federal Bureau of Investigation (FBI), was dismissed by U.S. President Donald Trump on May 9, 2017.