At setup, the user can decide to enable Cached Exchange Mode. New Exchange accounts set up on computers running RDS use Online Mode by default. When you configure a computer running RDS to use Cached Exchange Mode, be sure to consider the additional storage space and disk I/O that are required for multiple client accesses. Outlook 2016 supports running in Cached Exchange Mode in a Remote Desktop Services (RDS), formerly known as Terminal Services, environment that has multiple users. So, when you use Cached Exchange Mode, Outlook must be connected and open at the assigned delivery time for the delayed delivery message to be sent. Retrieving rights to a rights-protected message.ĭelayed delivery options are client side in cached mode and server side in online mode.Accessing public folders that were not made available offline.Setting, changing, or canceling an Out of Office message.Working with Shared Folders that were not made available offline.These operations won't function when Outlook is not connected and can take longer to complete on high-latency connections. Large mailboxes on computers that don't have sufficient hard disk space for a local copy of the mailbox.Įven when it is configured in Cached Exchange Mode, Outlook 2016 must contact the server directly to do certain operations.In addition, we recommend that you consider using Encrypting File System (EFS) or BitLocker as a robust solution. Heavily regulated compliance or secure environments where it is a risk to store data locally.Kiosk scenarios, where a particular computer has many users who access different Outlook accounts-and the delay to download email messages to a local cache is unacceptable.Online mode is useful in the following situations: Users who have high-latency connections (greater than 500 ms) to Exchange Server.Users who frequently work offline or without connectivity.Users who frequently move in and out of connectivity.Mailbox data is only cached in memory and never written to disk.Ĭached Exchange Mode is the preferred configuration in Outlook 2016 and is useful in the following situations: Online Mode works by using information directly from the server, and, as the name implies, it requires a connection. Hopefully I can catch them all and update before things break.We recommend always using Cached Exchange Mode with a Microsoft 365 account. I have not yet had any Outlooks actually stop working after receiving this message. The PC I manually installed the update on has not had a reoccurrence of the message for 48 hours now. If you click the "install" button and it goes to Windows Update and it looks like there is nothing to update, the message will disappear but it will re-appear after a few hours, so I wouldn't count on that fixing anything. I did this Sunday and the message has not come up again since then. 1001, however the version number on Outlook.exe file properties updated to. I failed to realize that the MSI version of 2016 apparently doesn't automatically update? Or maybe it will work if you check "install updates for microsoft products" in Windows update as discussed in another comment - I haven't confirmed that.Īlso note that even when I manually installed the update, the version number in Outlook was STILL listed as. This appeared Sunday for us on a few PCs using the MSI version of 2016 (volume license). Quick answer: I had to download the latest public update from here and manually install:
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