I can confirm the "3 day slider" thing!

This is really a strange issue (and very annoying fort the compliants that we are receiving from customer)...

Are you seeing this when adding a new account to Outlook?

We haven't seen this. But our users haven't added new accounts since the update, just using their accounts that were configured before update. Outlook 2016.

I did further tests by trying to change the slider to see what happens with the various synchronization periods: for my test account (which is a customer of mine who reported the problem to me...) it seems to work up to six months, but if i put it to more than outlook sync stops working.

If I roll it back to six months (or less) then it starts working again, but of course I only see the emails from the synchronized period.

The worst part is that this forces me to only see the last six months in all other folders as well, not just the INBOX...

In fact, if I set the synchronization to six months, Outlook makes everything that is older disappear from any folder, even if it had already synchronized it with older items before.

So, while this may be close to a workaround, the downside is that it causes other problems that the customer may not accept…

NOTE: of course everything remains on the server, so from webmail I can still see items older than six months in any folder

If you add a new account then it only shows if the slider is on 3 days. It doesnt work with 6 mths since the sync stops even if you slide it to 6 mths or less. I t cannot sync more than 3 days in total.

Hi Brian!

This problem probably manifests itself differently from user to user and is not always the same...

In my case, as I said, if I leave the slider at 6 months everything works (except that I don't see the older items, but I can see them in webmail)...

At the moment I have set this up as a temporary workaround for my customer, who is not happy and complains that it's not good, but for the moment he at least is able to work.

In your case, the problem probably manifests itself in a slightly different (and worst...) way...

You are right. And the clients are NOT happy to say the least.
Why dont we have a BETA user group here to test things before they are released??
This is basic stuff that MUST NOT happen in a production environment.

There used to be a BETA group (I myself spent a lot of my time there...), but sadly this problem was not discovered during the beta...

  Unfortunately, even the beta test isn't perfect and can't catch 100% of the bugs...

I know but adding an accoount and sync should be on the list of things to test in a release cycle.
No matter what.... this is very basic and critical functionality.

Agreed Ron. It should be pulled from the repository until it was fixed and the devs should be working round the clock for the next release that fixes these issues. Nothing else would be to little to ask if you consider how many people are affected by this and the reputation of the MSP's towards their paying customers.
But at this state we should put our heads down and provide all the info we can to the devs to fix it and learn from this going forward.

Hi, All

We're aware of the issue and it's actively being looked into. We were able to replicate it this weekend, and have traces to help track down what's going on.

For the time being, as Gabriele mentioned, a temporary workaround is to set your sync period to something less than "all", especially when setting up a new account. 

THX Derek

Hi Derek
For us only 3 days are working. If you extend it beyond that its stuck at 3 days sync.

We cant get it to work in any other way

Got it, Brian. We'll add that to the task and make sure it all works. 

Hi Derek.
Tried extending it to 3 mths when the initial account is created and using three days as a starting point.
When the sync period is extended then browsing in subfolders makes outlook crash.