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I think MMS service is more important for Teams Meeting, because except for new Teams users, other Skype onpremise or Skype online users who migrate to Teams will encounter a problem: "what about the Skype Meeting I booked before? can I still use it after I migrate to Teams?" Here Microsoft provides a solution: Meeting Migration Service, which updates / migrates users' existing meetings (especially Skype Meeting) under these scenarios

When users migrate from local to the cloud (whether to Skype for Business Online or to TeamsOnly). When an administrator changes a user's audio conference settings (such as assigning an audio conference license to a user whose previously booked Teams Meeting needs to add the conference dial-in number to the reservation information, MMS can do this automatically) when online users upgrade to Teams only, when the user mode in the user's TeamsUpgradePolicy is set to SfBwithTeamsCollabAndMeetings, it will automatically trigger MMS to update when you use PowerShell cmdlet, Start-CsExMeetingMigration (that is, manual migration triggered)

However, the conference migration service MMS cannot be used in the following scenarios:

The user's mailbox is in the local Exchange because MMS must use Exchange online. Users migrate from Teams to locally deployed Skype servers.

In this case, end users can use the conference migration tool to migrate their own meetings, please refer to * 1

How does MMS work? As shown below:

1) MMS searches the user's Exchange mailbox for all meetings for that user.

2) according to the information in the user's mailbox, MMS finds the user's Skype Meeting or Teams Meeting.

3) in the email, MMS will replace the meeting information in the meeting details, such as the meeting information / link of Teams.

4) MMS will send an updated version of the meeting to all conference recipients on behalf of the meeting organizer, after which all attendees will be updated at the relevant meeting.

The following is an effect of migrating from Skype Meeting to Teams Meeting, as follows:

Note the following when using the MMS migration service:

1) from the time the MMS is triggered, it usually takes about 2 hours to migrate the user's meeting.

2) after the meeting is migrated, MMS replaces everything in the online meeting information block.

3) MMS migrates only those Skype or Teams conferences generated through Outlook Add in.

4) meetings with more than 250 participants (including organizers) will not be relocated. (because Teams Meeting supports up to 250th participants)

5) MMS will be triggered automatically only if you assign SfBWithTeamsCollabAndMeetings or TeamsOnly mode to the user's TeamsUpgradePolicy alone.

6) the MMS migration process takes at least 90 to 120 minutes.

Use the Powershell command:

# Log in to Teams Powershell

$String = "xxxxxx"

$username = "xxxxxx@demo.onmicrosoft.com"

$TenantDomain = "demo.onmicrosoft.com"

Import-Module SkypeOnlineConnector;$PWord = ConvertTo-SecureString-String $String-AsPlainText-Force

$Cred = New-Object-TypeName System.Management.Automation.PSCredential-ArgumentList $username, $PWord

$CSSession=New-CsOnlineSession-credential $Cred-OverrideAdminDomain $TenantDomain

Import-PSSession $cssession-AllowClobber

# query the user's Teams coexistence mode

Get-CsonlineUser tangx@ucssi.onmicrosoft.com | fl * teamsupgrade*

# assign SfBWithTeamsCollabAndMeetingsWithNotify mode to users

Grant-CsTeamsUpgradePolicy-Identity tangx@ucssi.onmicrosoft.com-PolicyName SfBWithTeamsCollabAndMeetingsWithNotify

Finally, once the coexistence mode is changed to SfBWithTeamsCollabAndMeetingsWithNotify, you can see that the previous Skype Meeting will be migrated to Teams Meeting through MMS.

# you can force the migration of Skype Meeting through the command and check the status. It can be seen that the migration time is still relatively long.

Start-CsExMeetingMigration-Identity tangx@ucssi.onmicrosoft.com-TargetMeetingType Teams-Verbose

Get-CsMeetingMigrationStatus-Identity tangx@ucssi.onmicrosoft.com

In addition to the required Identity parameters, it has two optional parameters, SourceMeetingType and TargetMeetingType, which allow you to specify how to migrate meetings:

TargetMeetingType:

Use TargetMeetingType Current to specify that Skype for Business meetings are retained as Skype for Business meetings and Teams meetings as Teams meetings. However, the coordinates of the audio conference may change, and any local Skype for Business conference will be migrated to Skype for Business Online. This is the default value for TargetMeetingType. Use TargetMeetingType Teams to specify that any existing meeting must be migrated to the team, regardless of whether the meeting is online or hosted locally in Skype for Business, and whether or not any audio conference updates are required.

SourceMeetingType:

Use SourceMeetingType SfB to indicate that only Skype for Business meetings (local or online) should be updated. Use SourceMeetingType Teams to indicate that only team meetings should be updated. Use SourceMeetingType All to indicate that Skype for Business and team meetings should be updated. This is the default value for SourceMeetingType.

List some commonly used commands:

# the following command returns complete details on all migrations that occurred from October 1, 2018 to October 8, 2018.

Get-CsMeetingMigrationStatus-StartTime "10Compact 2018"-EndTime "10Universe 2018"

# the following command returns the status of the user ashaw@contoso.com:

Get-CsMeetingMigrationStatus-Identity ashaw@contoso.com

# the following command to get a list of affected users and specific errors reported:

Get-CsMeetingMigrationStatus | Where {$_ .State-eq "Failed"} | Format-Table UserPrincipalName, LastMessage

# to see if MMS is enabled in your organization

Get-CsTenantMigrationConfiguration

# fully enable or disable MMS

Set-CsTenantMigrationConfiguration-MeetingMigrationEnabled $false

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