When the house was built in the 1890s, this was originally an open verandah and was enclosed sometime during the 1940s or 50s, so that's how long the windows have been there.
Plenty of time to go rotten without anyone noticing.
He got started but.... Uhoh.... he found a huge area of dry rot.
The Space Cadet would never allow his DIY talents to be outdone by a mere beam of crumbling rotten wood, so the battle began.
He pried out all the bad wood, and replaced it with 2'x6' cedar, but the whole window had to come out eventually.
"Shall I move all the stuff that's inside?" I asked.
"No need, I'm not going to make a mess", he said.
So I moved all the stuff anyway. Good thinking.
Once the beam was replaced and the vertical supports were strengthened, it was time for a coat of primer. Luckily I found a can of white primer stored in the basement with just enough left to do the job.