Fix for: Can’t activate Outlook 2015 on Mac “Another account from your organization is already signed in on this computer.”

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1. Quit Application.
2. Open Library folder of current user. (to use OPTION key)
3. Delete following files from LibraryContainers
com.microsoft.Office365ServiceV2
com.microsoft.onenote.mac
com.microsoft.outlook
Note: com.microsoft.Office365ServiceV2 is sharing with Outlook/OneNote because new apps uses same activation app that is Office365ServiceV2.app
4. Delete following files from LibraryGroup Containers
*.ms
*.Office
*.OfficeOsWebHost
Note: OfficeOsWebHost created by activating Outlook only, maybe.
5. Boot KeyChain.app and remove following application password if need it.
<For Org ID>
Unknown
Microsoft Office Identities Settings 2
Microsoft Office Identities Cache 2
<GUID> (Type is MicrosoftOffice15_2_Data:ADAL:xxxxxxxxxxxxxxxxxx)
<For Live ID>
Microsoft Office Identities Settings 2
Microsoft Office Identities Cache 2
<GUID> (Type is MicrosoftOffice15_2_Data:Live:cid=xxxxxxxxxxxxxxxxxx)
Note: these time stamp is same or nearly. Be careful, these keyChain object for activated account is shared with Outlook and OneNote as you know.