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i've seen this problem on both WebOS and Windows Mobile.
it works fine over IMAP but doesn't work worth a lick over EAS.
i'd imagine it's something in the server, and how its passing the OWA XML to the device.
Anyone know of a fix? it's rather annoying and has been this way for as long as i can remember us using it (Zimbra 4?)... and this has been across a number of devices.
vote for that bug which is the official fix for it. on a side note, both the iphone and android devices can get html email from zimbra via EAS, just not using the conventional way, its mentioned i think in the bug
Bugzilla
Wiki
Source
HTML Email doesnt work for Mobile clients 
Linear Mode
