You can import the previously exported message history in your computer to the Message Manager by taking the following steps:

1. Please click "History" on the TradeManager as follows:

2. Click "Import" button at the right top and select message history previously exported.

3. Click "Open":

4. Click "OK" on the pop up window:

At this time, previously exported message history will be in Message Manager. In this case, even messages in Message Manager were deleted, you can still get them back by importing: