Terming the Indian Defence Estates Service (IDES) a "crucial institution", President Pranab Mukherjee on Monday asked a group of visiting probationers to learn and adopt advanced tools of management to be good professionals.Addressing a group of nine probationers of the IDES 2014 batch who called on him at Rashtrapati Bhavan, the president said the IDES was a crucial institution mandated to deal with municipal administration of 62 cantonments."IDES performs the crucial task of developing and maintaining cantonment townships as models of urban management and local self-governance. This organisation has to make sure that an environment-friendly habitat exists in all the cantonments," Mukherjee said.He also urged the officers to work with the highest standards of professionalism, dedication, commitment and sincerity that is expected of an important service.