General :: Exchange 2007 / Activesync / Disappearing Emails?

Interesting problem that I seem to have had out of the box (and which has started when I traded my old treo in for this android device): emails regularly disappear both from my Note, the exchange server and thus everywhere else as well, without any intervention on my part. My Note notifies me of new email, I glance at the overview, and sometimes no more than a few minutes later, that new email is completely gone.

Another interesting feature that popped up during testing is that emails sent from the device to this very account do appear in the sent items list both on the device and on the exchange server, but *only* at the inbox on the android device. And as with some of the regular incoming emails, these too disappear. As external emails (i.e. sent from for example gmail) thus far seem to stick, I am suspecting an issue with either activesync itself or exchange and activesync, but I can't be sure.

Noticed a few other threads both here and elsewhere about disappearing emails, but most (if not all) of these seem to be about POP3 where part of the default routine is of course deleting from the server. apps at issue:

- Android 2.3.6 and 4.0 (problem stayed after the upgrade)
- Default mail client on both versions (this particular exchange account has thus far proven a bit troublesome to configure with for example k-9 and touchdown)
- Exchange Server 2007 server / activesync