Exchange 2016 - Public Folder Database close to 2 TB.

What can/should we do?

start cleaning it out
if there are things you need to keep for legal or other reasons, you might want to look at a 3rd party archiving solution

Public folders

https://docs.microsoft.com/en-us/exchange/collaboration/public-folders/public-folders?view=exchserver-2019

You can attach a second DB and move some content there.
But what in the hell you are storing in 20 folders? 100 GB per folder.
Even hard core outlook users seldom reach such a limit.
Especially, who ever will read what is inside, I mean in his current and the twenty following lifes.

I guess, Seth is on the right track. Clean it up....

ha. There are many PF mailboxes that were required for a Exchange 2007 to 2013 migration, at the time this was MS recommendation.

Thanks

yes, but at the end it is also not a problem to reorganize the databases just by moving the mailboxes.
But cleaning up is the first choice, also for normal mailboxes, the second maybe a few rules and if th erules do not work a few policies for auto cleanup. It is like a roof, everything you don't need anymore is store there, and after 20 years, you throw it.
 

How do you get users to clean review and clean 20TB of data?

I mean 2 TB

thanks for the suggestions.