Hi kaidomac,
Lucky for those that skipped that update. When some things go wrong, they often go wrong big scale.
All vendors suffer from these mishaps some day or other, "someone pushing a wrong handle there".
Prepare for it in the future with a pre-update emergency back-up scheme, but that is wisdom in hindsight.
polonus
The difficulty is two-fold:
1. Receiving email viruses that come out same-day
2. Quantity of users
As much as I hate not having time to test A/V updates on a test group beforehand, it's important to have the updates come in as fast as possible because I've run into issues not doing that - as soon as a virus fix is identified by Avast, added to the database, and rolled out to users, they are protected. So to me, it's worth the risk for the occasional hiccup like this to have the most up-to-date protection possible, because it has bitten me before in bad ways with zero-day exploits. Plus, I support several companies & several branches as well, so it's not really feasible to babysit everything 24/7 due to workforce budgets being what they are.
The second issue is quantity of users. Even with backups, reverting 200 users who have physical machines & are not on a Terminal Server is a logistics nightmare. I spent all last night trying to fix things remotely & have had to go on-site to patch up all the little bits & pieces remaining. Reverting to a prior backup is possible, but then the users lose all of their work for the day (times however many users you have), versus just restoring from the vault. Although restoring from the vault hasn't fixed 100% of the issues I've run into, so I've had to do some further work, like re-installations of certain software.
Very frustrating all around.