"It is tragic that Michael has been taken from us in the prime of his life. His business skills, energy, commitment and passion made him a fine leader and he will be greatly missed," said executive chairman John Holdsworth.
"Michael has had an extremely successful career. During his 18 years with Datacom he built up a strong network of clients, colleagues and friends, all of whom are shocked and deeply saddened by this tragedy.
"Michael is survived by his wife Sue and three children Fraser, Ashleigh and Cameron. Our deepest sympathy is with them and their extended family at this time."
Holdsworth will take over Browne's responsibilities until further notice.
Browne's appointment as group CEO role was only announced in July. An 18-year veteran at the company, he previously served as CEO of Datacom's Australia and Asia operations.