Adobe Connect Meeting Chat Pod supports:

• Sending a chat message: 1024 characters
• First time history fetch: 250 messages
  • Upon joining any meeting,  the most recent 250 messages are fetched from the server.
  • If there were more than 250 messages, scrolling up will not display the older messages. To read those older messages, simply choose the option to email the chat content
• Character limit retained in the chat: 50,000 RTF characters (after which it is trimmed to half or 25,000 characters)
  • The character trimming executes every time the character count reaches 50,000
  • The warning message reappears when the character count reaches 80%  of the limit
  • Emailing the chat while the warning message is still on will email the entire chat thread

For more details about character limits in Adobe Connect Meeting pods, see the following tech-note: Character Limits in Adobe Connect Meeting Pods