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I have a client who's Emails disappear and reappear in different folders.
For example Email is listed in the inbox, click to open it may open or say that it does not exist on the server. Close the email popup and the email no longer shows in the inbox. Search each folder because it may be in the deleted folder or in the junk folder. Open it from that folder, read it, close it, then click to open and it disappears again. This is causing quite the headache since there is no consistency to what is happening.