Similar Applications
Microsoft offers too many tools that are similar to Teams, such as Skype, Microsoft Stream, Yammer, and OneNote. This leads employees to confusion as to what tools they should be using.
Channel Limits
Microsoft Teams limits the number of channels that can be created to 100. This may be enough for smaller organizations but larger corporations may run out of channels for communication.
No Unified Search Feature
Microsoft offers no unified search feature for conversations that take place across all tools which means there is no way to do a global search for a file or conversation that may have happened in a tool outside of Teams.
Organization Use
Organizations that use Office 365 may dictate that employees use Microsoft Teams as opposed to other tools that may be a better fit for the organization.
File Storage
Everything uploaded into conversations gets filed into the channel root folder. Trying to organize these conversations into other folders breaks the file links in the conversation.