[horde] ActiveSync email vs IMAP email

Michael J Rubinsky mrubinsk at horde.org
Mon Feb 4 15:13:48 UTC 2013

Quoting Tom Seeley <horde at tomseeley.co.uk>:

> Quoting Michael J Rubinsky <mrubinsk at horde.org>:
>> As explained on the wiki, the only thing that triggers Horde to  
>> tell the AS email client to break the PING or looping SYNC is the  
>> arrival of a new email in a pushed mailbox. This means that flag  
>> changes or expunging messages, alone, will not cause the client to  
>> refresh. Once triggered, however, all changes are synched. Manually  
>> refreshing the mailbox will also cause all changes to be synched.
> This (including the wiki) explains a behaviour I had also seen, ie  
> that deletions on the AS device seemed to sync up, but deletions on  
> imp didn't sync down (ie I hadn't "purged").
> If anybody is interested, setting imp to use a trash mailbox seems  
> to correctly simulate the behaviour of an Exchange server.  That is  
> to say that it causes messages deleted in imp to be deleted  
> (removed) from the AS device at the next refresh (according to the  
> rules described above).

This is becuase EAS does not support the /deleted flag. According to  
EAS, a message is either in the mailbox, or it's not. There is no such  
thing as a message "flagged for deletion" so these changes are never  


The Horde Project (www.horde.org)
mrubinsk at horde.org
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