As an admin for Office 365, you can configure your users' current Office desktop applications work with Microsoft 365.
In this article
For the procedure to manually configure Outlook for your users, see Connect Outlook to this account.
If your users have been provisioned for Lync and they currently have Office Communicator subscriptions, you can manually configure Lync for those users. You can do this by modifying the following Office Communicator registry settings for each provisioned user. In the Registry Editor, go to:
Set ServerSIPURI to a string value of the user's SIP proxy address
Set ConfigurationMode to a dword value of 0
Delete the ServerAddressInternal string
Delete the ServerAddressExternal string
Delete the ServerUserName string
Configure SharePoint Online
If your users have been provisioned for SharePoint Online and they have Windows Internet Explorer 7, Windows Internet Explorer 8, or Windows Internet Explorer 9 installed on their computers, you can manually configure SharePoint Online for those users. You can do this by modifying the following SharePoint Online registry settings for each provisioned user. In the Registry Editor, go to:
Add a key for the SharePoint Online domain.
Add a subkey to the newly added domain key for your company's SharePoint Online home site.
Add a dword named https and set it to a value of 2.
The SharePoint Online Host Name is added to the Trusted Sites zone in Internet Explorer after you have modified the registry settings.