According to Gartner's Elliot, it's most common for Lync to be deployed in environments that are already heavily into Microsoft.
"We see Lync being strong where a Microsoft portfolio is being advanced broadly," he says.
Likewise, Lync may be less attractive in environments that are committed to, say, IBM's collaboration and communication products, since IBM has its own Sametime UC component, or that are heavily invested on Cisco networking, IP telephony, video and collaboration wares like the Cisco WebEx and Tandberg products.
Lync is also a UC system that is tightly integrated with a communication and collaboration stack, which differs from other vendors whose offerings approach UC more strongly from other areas like telephony.
"The big question or criteria for choosing a UC system is which infrastructure are you better able to support? Which one will link most easily into your business apps and processes," says Forrester's Dewing.
IT departments should also determine the total cost of ownership (TCO) of UC systems, the difficulty in installing and integrating it and its present and future capabilities to be accessed from a broad variety of devices, he says.