Mail.app conversations contain messages from other conversations in Exchange account

When grouped by conversation, messages from completely separate conversations are appearing in the message threads. This only appears to be happening with an Exchange account (Office365). I have deleted the account and re-added it, to no avail. MS Outlook groups them correctly, as does the Office365 web version of Outlook, so I am assuming it's an issue with the OS X implementation of Exchange in Mail.app...
I'm using Mail.app version 8.0 on OS X 10.10
Any help appreciated!
Thanks,
James

When grouped by conversation, messages from completely separate conversations are appearing in the message threads. This only appears to be happening with an Exchange account (Office365). I have deleted the account and re-added it, to no avail. MS Outlook groups them correctly, as does the Office365 web version of Outlook, so I am assuming it's an issue with the OS X implementation of Exchange in Mail.app...
I'm using Mail.app version 8.0 on OS X 10.10
Any help appreciated!
Thanks,
James

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