Cleaning and Stain Removal - What happens to mold after water damaged area has been dry for months or even years?

Just wondering because I plan on redoing my water damaged ceiling in a few months. Water is no longer leaking thru and the area is dry. Some parts of the ceiling which used to leak haven't leaked for years. Anyone know what I'm in for?

You will be shocked to find out how long interior walls and ceilings can remain wet after leaks. In most of those areas there is no air flow, so the water and moisture just stands in there. It takes warmth and moisture to get mold/mildew started. After its established it doesnt take much to survive. I would bet its still there. Along with most of the plaster and wooden beams being ruined. I would replace, clean, seal everything. Replace the bad areas, clean any surface mold and seal the wood. Check with your insurance to see whats covered

I agree with Dockduck.

Mold that is dry will lay dormant for years, waiting for moisture to begin growing again.
Also, dry spores are able to be as toxic or irritant as when growing.

If you do a search on mold removal you will find a lot of usefull information.