Just make sure you have the latest Teams PowerShell module to perform the below PowerShell operations first, since the SfBO PowerShell module is decommissioned. This is a straightforward way to determine if you have any verified domains in your tenant that are SIP-enabled, but not in use. If youвЂ™ve verified domains in your tenant, but are not using them for SfBO and Teams, you can disable them for this functionality by running the Disable-CsOnlineSipDomain cmdlet. If you are in Exchange hybrid mode, consider completing the migration to Exchange Online before going to Teams Only mode.Д«efore you can set the TeamsUpgradePolicy to Teams Only mode, you need to comb through all active SIP domains and make sure the DNS exists and points to SfBO.Plan to uninstall the Skype for Business (SfB) client.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.ДЄfter 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.

Skype for Business Server (SfBS) Hybrid will still work with all modes.

Where your Exchange mailbox is, matters for success.

Will Microsoft Teams Rooms be able to join SfB meetings after July 31st?.

Do you need the Skype client after you have moved to Teams Only mode?.

Sign in skype online upgrade#