I'm tiptoeing through my upgrade to 2017.
Presently, we have a PDM Standard 2016 vault and three seats in use.  I've upgraded the License server to 2017 without issues.  The next step would seem to be upgrading the DB and Archive servers. I'm concerned that if I do this, my users won't be able to get into the vault until they upgrade their PDM clients to 2017.
Is that the case?