Hi.
We have a common users that several users have added as an additional mailbox in their Outlook.
This user have a contact list of around 450 contacts. This has worked a while, but now they get the following error when trying to look at the list: "This contact group has been edited with a newer version of outlook and contains too many members"
It has not been opened in Newer version of Outlook. All users have Outlook 2010 (exchange server 2013).
I recreated the whole list in December because of the same error message. Worked fine until today.
Does anyone know why this is happening?