In the letter, Fitzgerald admits that he has been told some emails from the President and Vice President's offices have been deleted, though he cautions that "no pertinent evidence has been destroyed."
"In an abundance of caution," he writes, "we advise you that we have learned that not all email of the Office of the Vice President and the Executive Office of the President for certain time periods in 2003 was preserved through the normal achiving process on the White House computer system." [Nixon's missing minutes??]