Hi Chris,
this happens to me even if I do not check the gmail-account online. I tried it out in a kind of laboratory condition. I sent one email, downloaded it to my X50v, send a second one, downloaded the email, the first disappeared and so on. I tried several scenarios: with opening the email - without opening etc. What confuses me is that the "normal" outlook has never shown this problem, so I assume it is a peculiarity of Pocket Outlook.
When I read your suggestion, I immediately fetched for my PDA and tried to change the settings. However, I could not find anything like this in my Axim. This type of setting is only available on the Gmail site. However, if you set it on "all" emails, it caused this strange error message, which says something like "Message cannot be downloaded to your mobile device. Make sure you are connected and that your e-mail account settings are correct. Then, try to download messages again." So to avoid this error message, I changed the setting to only download new emails according to other posting in thise forum.
But as I just found out, there are others experiencing the same problem
http://www.aximsite.com/boards/showt...ection+problem