It all depends on the package offered. Most of the time, you have to purchase MS Office separately, or get a very stripped down version of it.
Windows 10 is going to try and herd you into Office 365, a cloud-based SaaS (Software as a Service), which is the equivalent of signing a 30-year lease on the car rather than buying it.
“Most of the time, you have to purchase MS Office separately”
“Purchase” isn’t the right word any more, I guess. When we bought our two Windows 10 Envys, we got Office 360. Every year on a certain date, you must renew and pay for the next year. If you don’t, the Office Suite stops. You and your files are held hostage until you fork over the money. So I guess we don’t technically “own” Office. Our deadline for the next year is coming up.
Thank heaven my Office 2003 Professional disks still are loading into the Windows 10 laptop. I’ll order a new Windows 7 laptop next week because Windows 10 SUX. The Explorer File Manager in Win 10 is just dreadful!
Not most of the time, Office has never been a part of Windows (any version) and either has been preinstalled with the cost added to the system or purchased separately. If you own a licensed copy, you may be able to install it under Windows 10, but I think it may need to be Office 2007 or later.
If you’re determined to go free, I would recommend tying Open Office which will save files in an office compatible format you can share with other users of office.