So first of all, thank you both of you for the support! It's a tricky issue, cos I've trying to track it from the web-inteface
www.schoolmail.... from Outlook and from AM and there's even a difference as to whether you view the conversation thread from the Sent Items folder or from the Inbox ... clearly both folders show the thread of emails, but one folder orders it correctly and the other does not. It is completely a mind-f%ck but nevermind. Will elaborate on it later if needed
Did u reply using outlook or AquaMail? If it's outlook (not AquaMail) the issue is not related to AquaMail.
I replied in Outlook, but as I said the issue had never occurred in the last ... more than 5 years that I've been using Outlook. It occurred only after I tweak those settings in AM. That's why I though those settings had an influence on my email accounts and that reflected in the strange behaviour in Outlook. I wasn't referring to any magical time machines, @StR ... but ok ... joke's on me. I think I clarified the issue and the fact that it never occurred in the last 5+ years of my using Outlook.
On a serious note, the problem is most likely stemming from the lack of synchronization between your phone and one of the servers (which one, - that depends on several details: whether you used Outlook or Aquamail, how your Aquamail is configured etc.). So, that's from the difference in the time stamp on the two messages, and the origin of those time stamps is different for both messages.
One of the factors the might help you to overcome this artifact in Aquamail is this option:
open the account’s options and folders -> IMAP options, and change “which message date/time to download” to “Date/time sent (from message header)”.
(Read some thoughts related to that option and message ordering in the FAQ item "Messages out of order, or wrong message dates": http://www.aqua-mail.com/?page_id=227 .)
I understand that it is a lack of synchronization but let me re-clarify the issue again. So, firstly I modified the settings in AM as advised. That then had the expected and desired effect of how AM displays emails threads on my phone. Few days go by, phone is away from me, I sit my a$$
on the PC and reply emails on Outlook 2010. It was at that point that 2 of the emails (and plenty more upon further tests) I replied via Outlook got messed up, as I described - my reply was placed before the email I was replying to. That never ever happened before. That's why I thought it's prolly sth to do with the AM settings I tweaked and the fact that they somehow had an effect on my accounts. Those effects on my accounts reflected in Outlook and in AM, but not in the web-interface
www.schoolmail....com - there the crazy 'time-machine' issue is not present.
Anyway StR, I tried the setting you are suggesting, and ALSO did reindex conversation, but the expected effect was not there.
Let me just ask this - do you know where in Outlook 2010 one can find the setting you're describing -
“which message date/time to download” to “Date/time sent (from message header)”. I cannot find it anywhere!