I'm not sure what you are doing, but as a start point make sure your messages are cached in order to view them offline. 

<p class="MsoNormal">Hi. I’m new to Pegasus, trying to get set up from my old Gmail account. I’’ve got it so I can see all my folders, etc.; however, when I am offline, and go into “offline mode”, if I try to open a folder to see the emails, I get the message,</p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Profile 'Gmail':</p> <p class="MsoNormal">The IMAP server that manages this mailbox or folder has reported an error during the operation you have attempted to perform.</p> <p class="MsoNormal">The operation cannot be completed.</p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">(If I’m actually connected, but in offline mode, I <u>can</u> see the messages.)</p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Any ideas?</p> <p class="MsoNormal"><o:p> </o:p></p> <p class="MsoNormal">Thnx</p><p class="MsoNormal">TVZ</p>