I am accessing OWA via BIS. I just noticed this week that when I delete a email on my computer, it gets deleted on my BB. I don't think this was the case until last week. Is this a BIS upgrade or something?
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If it's a web interface, you can set the account to delete from the device when the email is removed from the server. If it's a desktop client, then no, the client has no way of interacting with the BlackBerry unless you are synchronizing with the desktop.
Posted from my CrackBerry at wapforums.crackberry.com