Make sure users with other TeamsUpgradeEffectiveModes are also updated.Set the global TeamsUpgradePolicy to Teams Only mode.Make sure SharedSipAddressSpace is set to $False.Validate DNS records for all enabled SIP domains.

There are ways to flip your tenant over to Teams Only mode yourself, and those steps are outlined below: If necessary, you do not have to wait for Microsoft to help you with the transition. Figure 1: Microsoft Teams Upgrade Message. During that time, Microsoft will help flip your tenant to Teams Only mode for all users homed in Microsoft 365.Īfter that period, all other modes like Islands, Meeting First, or Meeting and collaboration will not be available options for your users, as these modes were just steps along the way to Teams Only mode. To find the date specified for you, navigate over to the Teams admin center.

Microsoft will offer assisted transitions for your tenant during specified periods. Teams Only mode will be the only option for users homed in Microsoft 365. So, what does that really mean? It means just that, SfBO will not be available in Microsoft 365 anymore. Soon July 31 st, 2021, will be here and the official Skype for Business Online (SfBO) retirement day looms closer.

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