Comment 2 for bug 1097565

I would suggest:

1. when setting/updating site expiry should it update the user expiry of all existing users (maybe not site admins)? or only newly created users?
It should go for all accounts that do not have a specific expiry date set already. Good idea to exclude the site admin from expiry.

2. should it override existing set expiry for user (or only if less that existing user expiry)?
I would not override existing specific expiry dates as someone has set those specifically. If we reset the expiry dates for those that have already been expired, their accounts suddenly become active again which should not be the case. Thus, see 1. Expiry for all accounts that do not have a specific date set.

3. should the setting/updating of side expiry notify affected users (email/internal notification)?
No. There is a second setting which you can activate letting users know when their account is about to expire / be set to inactive.