Depends what they are using XP for.
If it's not for core systems then no big deal.
If it's for items that have a fixed scope (no regular patches required) then no big deal. It may even be on a stand-alone system.............
Plenty of big corporates out there still using and developing on XP Platforms.
The benefit is that it's quite stable and well understood.
No immediate need to panic I'd say..................
Arc