I have updated my contacts via Account>contacts.
I have a couple of groups.
When scheduling a meeting, if I add a group of contacts, that list contains an older list of people versus the up-to-date list of contacts in the group.
The only manual way to fix this is to make a new group, move all users to the new group, delete the old group, rename the new group to the old group name...
In addition, if you have added someone in the past, then deleted -- then re-add them. When you create a new meeting they appear twice in the list
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