Skype for Business Online Limits

The limits in Skype for Business Online fall into the following categories:

Note

The limits applied to an Office 365 organization can differ depending on how long the organization has been enrolled in the service. When a limit is changed in the Microsoft data centers, it can take some time to apply the change to all existing customers.

Peer-to-peer limits

  • File transfer limit The maximum size of a file that can be transferred in a Skype for Business Online IM conversation. To learn which file types are blocked for file transfer, see the Microsoft Support article about sending and receiving files or attachments in Skype for Business Online.

  • Open tabbed conversations limit The maximum number of conversation tabs that a Skype for Business user can have open at one time.

Peer-to-peer limits across Office 365 options

Feature
Skype for Business Server 2015
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise F1
File transfer limit
No limit
No limit
No limit
No limit
No limit
Not applicable
Conversation limit1
99
99
99
99
99
99
Open tabbed conversations limit
50
50
50
50
50
Not applicable

Note

1 A client can start a chat with up to 99 users by either manually adding them or sending an instant message from the context menu of a group or distribution list. For more information about instant messaging in Skype for Business Online, see Send an IM in Skype for Business.

Peer-to-peer limits across standalone options

Feature
Skype for Business Server 2015
Skype for Business Online Standalone Plan 1
Skype for Business Online Standalone Plan 2
File transfer limit
No limit
No limit
No limit
Conversation limit1
99
99
99
Open tabbed conversations limit
50
50
50

Note

1 A client can start a chat with up to 99 users by either manually adding them or sending an instant message from the context menu of a group or distribution list. For more information about instant messaging in Skype for Business Online, see Send an IM in Skype for Business.

Meeting limits

  • File upload limit The maximum size of files that can be uploaded to a Skype for Business meeting, including handouts and PowerPoint presentations.

  • Participants in a Skype for Business meeting The maximum number of participants (including the presenter) who can join a single Skype for Business meeting.

  • Presenters in a Skype for Business meeting The maximum number of presenters in a single Skype for Business meeting.

  • Skype for Business web app meeting participants The maximum number of Skype for Business web app meeting participants who can join a meeting.

  • Skype for Business web app anonymous participants The maximum number of Skype for Business web app meeting participants who can anonymously join a meeting.

  • Guests joining by phone The maximum number of guests who can call in to a meeting.

Meeting limits across Office 365 options

Feature
Skype for Business Server 2015
Office 365 Business Essentials
Office 365 Business Premium
Office 365 Enterprise E1
Office 365 Enterprise E3
Office 365 Enterprise F1
File upload limit
500 MB
500 MB
500 MB
500 MB
500 MB
Not applicable
Participants in a Skype for Business meeting1
250
250
250
250
250
Not applicable
Presenters in a Skype for Business meeting
250
250
250
250
250
Not applicable
Skype for Business web app meeting participants
250
250
250
250
250
Not applicable
Skype for Business web app anonymous participants
250
250
250
250
250
Not applicable
Guests joining by phone
250
250
250
250
250
Not applicable
Individuals in a team-call group
25
25
25
25
25
Not applicable

Note

1 If the number of participants in a Skype for Business meeting exceeds 75 participants, then the participant list (presenters and attendees) in the meeting roster will be truncated so that an individual attendee sees only the presenters and the individual attendee's own name. The full participant list remains visible to the presenters in the meeting. Also, Gallery View and IM errors are hidden from the attendees.

Meeting limits across standalone options

Feature
Skype for Business Server 2015
Skype for Business Online Standalone Plan 1
Skype for Business Online Standalone Plan 2
File upload limit
500 MB
Not applicable
500 MB
Participants in a Skype for Business meeting
250
Not applicable
250
Presenters in a Skype for Business meeting
250
Not applicable
250
Skype for Business web app meeting participants
250
Not applicable
250
Skype for Business web app anonymous participants
250
Not applicable
250
Guests joining by phone
250
Not applicable
250
Individuals in a team-call group
25
Not applicable
25

Meeting retention limits

  • Meeting content retention period The amount of time after the last person leaves a meeting that any uploaded meeting content is retained in Skype for Business before it is permanently deleted.

  • Meeting expiration period The amount of time after a meeting has ended that users can access the meeting.

Meeting retention limits across Office 365 options and standalone plans

Note

Each person can have a maximum of 1000 conferences in the database at any time.

Meeting Type
Description
One-time meeting Meeting will be accessible at least until 14 days after the scheduled time, or the last meeting activation, or last meeting update, whichever is latest.
Recurring meeting with end date Meeting will be accessible at least until 14 days after the scheduled end time of the last meeting occurrence, or the last meeting activation, or last meeting update, whichever is latest.
Recurring meeting without end date Meeting will always be accessible, provided there are new conference joins (activations) or scheduling updates at least once per year
Meet Now Meeting will be accessible for at least 8 hours.

Minute limits

For information about minute limitations in the Office 365 Domestic Calling Plan or the Office 365 International Calling Plan, click here.