The MailTip shows 200+ members in a DL but the DL actually have 4 members. Could anyone know how to fix?
The MailTip shows 200+ members in a DL but the DL actually have 4 members. Could anyone know how to fix?
What's the version of your Exchange server?
Is it only affecting this particular distribution list? Have you removed group members from this DL recently?
Please have a check in both Outlook and OWA and see if there is any difference.
It's also suggested to run the command below to verify the members included:
Get-DistributionGroupMember -Identity <DLName>
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@YukiSun-MSFT
we have exchange 2016 with cu19
it is showing only in outlook (to all users). it shows only 4 members in owa

Any changes were made to this DL before the issue started?
Are the users all running Outlook in cached mode? If this is true, how about switching to Online mode and check the result?
Besides, It's suggested to try creating a new Outlook profile on one machine to see how it goes. I am assuming if this is due to any client-side cache.
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I am following up to see how things are going with this issue. Did you get a chance to try creating a new outlook profile and check the result?
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