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Most users, especially those will laptops, will want Outlook to operate in Cached mode but you likely don’t want Outlook caching on boardroom / focus room / huddle room / client room computers. Cache mode copies a large amount of data from the Exchange server to an .OST file on local PC and in a boardroom that:

Outlook 2016 Turn Off Cached Mode Solve a problem where you can’t enable Use Cached Exchange Mode in Microsoft Outlook 2016 because it is grayed out. Note: This option is only available for accounts that are using Microsoft Exchange. I've been getting issues with cached mode for god knows how long, and I've just resorted to turning it off entirely to avoid the grief. It's my go-to first fix whenever I hear someone with an Outlook issue and 80% of the time, it'll fix it. Disable Cached Mode - office365 for Mac I have users who have issues when creating appointments in a shared calendar. I have this basically solved for Windows machines but for MACOS I do not see the same option.

1. takes a few minutes users seldom have in a meeting
2. opens a security hole by putting potentially sensitive email on another computer
3. take up considerable space, especially if you have hundreds of users

Outlook 2016 Cache Settings

So what you need to do is leave Outlook’s default settings of caching 1 year of mail on the users primary computer but block Outlook caching on shared computers like boardrooms. The problem is that Outlooks cached mode settings in HKey_Current_User (HKCU) and you need to apply it only to some computers.

To this, you simple need to set ITEM LEVEL TARGETING. Unfortunately most GPO’s do not have ITEM LEVEL TARGETING as an option and that includes CACHED EXCHANGE MODE GPO. Fortunately registry changes do and so all you have to figure out is what registry change you need to make. We have the answer:

1. Create new or edit an existing GPO
2. Expand USER CONFIGURATION > PREFERENCES > WINDOWS SETTINGS > REGISTRY
3. Right click and CREATE NEW
4. Set SoftwarePoliciesMicrosoftOffice16.0outlookost VALUE=NoOST REG_DWORD=2
5. Click the COMMON > ITEM-LEVEL TARGETING > TARGETING… (button)
6. Click NEW and add the condition you want. In the screen shots below I set it any computer in the OU = KIOSKS

Click on these screen shots to enlarge them

KB ID 0000507

Problem

I got asked how to do this today, a client has a number of roaming users (teachers) who don’t like waiting for Outlook to create a local copy of the mailbox each time they log on. To be honest as they have Exchange 2010 they would be better using the feature rich Outlook Web App (OWA) rather than the full client if they need to move around so much but hey, I was asked.

Solution

1. To do this you need to use a custom administrative template, thankfully Microsoft have them pre written go here to down load the administrative templates.

2. Download and extract the templates to your domain controller. Start > Administrative tools > Group Policy management console > either create a new policy and link it to your USERS or edit an existing policy.

3. Navigate to:

Right click > Add/Remove Templates.

4. Add > Navigate to the folder where you extracted the templates > ADM folder > en-us folder (change depending on your locale) > Outlk14.adm > Open.

5. Now Navigate to:

Locate “Use Cached Exchange Mode for new and existing Outlook Profiles”

6. Set the policy to “Disabled” > Apply OK > Close the policy editor.

Outlook 2016 Cached Mode Registry

7. Then get the clients to log off and back on again, wait a couple of hours, or manually run “gpupdate /force” on them.

Related Articles, References, Credits, or External Links

Outlook 2016 Disable Cache Mode

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