The institute quizzed 120 IT managers for its annual survey which was published last week. It found that 50% of IT managers took their full holiday entitlement, compared to 66% in the previous year.
Some 79% said their professional responsibilities affected the holidays they took and many claimed to have interrupted their holidays to attend to work.
Soaring in-tray duties were the primary reasons IT directors disturbed their holidays, and 46% said they would have to deal with 100 or more e-mails on their return after just one week away. A further 6% said they would have more than 500 e-mails when they got back to work.
Project pressure was cited as the next biggest cause of an interrupted break, where 25% had project deadlines to meet while away. Of these respondents, one IT director actually left a holiday to complete a project.
When questioned about sharing work with colleagues, 21% said their unwillingness to delegate affected the amount of holiday time they took.
Once on holiday, 19% of IT directors said they were unable to let go and ended up spending the entire break catching up with background reading to keep on top of work-related issues.
However, for some this was not a problem - 23% said they enjoyed their job so much they chose to work on holiday.