In organizational meetings, mobile media are commonly used to hold multiple simultaneous conversations (i.e., multicommunication). This experiment uses video vignettes to test how manager policy (no policy, pro-technology, anti-technology), device use (notepad, laptop, cell phone) and task-acknowledgment (no task-acknowledgment, task-acknowledgment) affect perceptions of meeting multicommunication behavior. US workers ( N = 243) who worked at least 30 hours per week and attended at least one weekly meeting rated relevant outcomes: expectancy violation, communicator evaluation, perceived competence, and meeting effectiveness. Results reveal manager policy and device use both affect multicommunication perceptions, with mobile phones generating the highest expectancy violation and lowest evaluation of the communicator and meeting effectiveness. Surprisingly, there was no effect for task-acknowledgment; however, a match between manager policy and task-acknowledgment affected evaluations. This paper unifies past evidence about multicommunication under the expectancy violations framework, extends theoretical understandings of mobile media use at work, and suggests practical implications for technology use in unfamiliar workplace situations.