To configure O365 accounts Outlook must be updated with latest security patches, so please turn windows update to download all security patches and install below outlook service packs on users outlook.
Outlook 2010 :-
Microsoft .NET Framework 4.5.2
https://www.microsoft.com/en-in/download/confirmation.aspx?id=42642
MS Office 2010 SP2 for 64 bit
https://www.microsoft.com/en-in/download/confirmation.aspx?id=39647
MS Office 2010 SP2 for 32 bit
https://www.microsoft.com/en-in/download/details.aspx?id=39667
Outlook 2007 ( Below both patch are compulsory)
patch:-
http://www.microsoft.com/downloads/details.aspx?FamilyId=cb4b2e4b-04ad-4e2c-a847-ac84d7d18096
MS office 2007 SP3 :-
https://www.microsoft.com/en-in/download/details.aspx?id=27838
Outlook 2013
Should be fully updated with all security patches
Outlook 2016
No patches require
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