Chat and share files in Teams
Start a new conversation...
...with the whole team
Select Teams 
, then pick a team and a channel.
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Select New conversation.
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In the box where you type your message, say what's on your mind and select Send 
.
...with a person or group
Select Chat > New chat .
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In the To field, type the name of the person or people you want to chat with.
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In the box where you type your message, say what's on your mind and select Send 
.
Reply to a conversation
Channel conversations are organized by date and then threaded. The replies in threads are organized under the initial post so it's easier to follow multiple conversations.
Find the conversation thread you want to reply to.
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Select Reply, add your message, and select Send 
.
Have fun with emoji, memes, and GIFs
Express yourself and impress your coworkers!
The Sticker 
catalog contains a wide variety of customizable stickers and memes — you can even upload your own! Check out Emoji 
for smiley faces and Giphy 
for animated GIFs.
Share a file
Sometimes words aren't enough, and you need to post a file to a channel conversation.
Tip: Teams works particularly well with Microsoft Office documents.
In your channel conversation, select
Attach 
under the box where you type your message.
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Select from these options:
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Select a file > Share a link.
If you're uploading a file from your computer, select a file, select Open, and then select Send 
.
You can always see all the files you post to a channel by going to the Files tab.