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The limits in Skype for Business Online fall into the following categories:
Note
The limits applied to a Microsoft 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.
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.
| Feature | Skype for Business Server 2015 | Microsoft 365 Business Basic | Microsoft 365 Business Standard | Office 365 E1 | Office 365 E3 | Office 365 F3 |
|---|---|---|---|---|---|---|
| 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.
| 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.
For information about minute limitations in the Domestic Calling Plan or the International Calling Plan, go to Country and region availability for Audio Conferencing and Calling Plans.