Hi,
I have a couple of clients both using Outlook 2011 on their mac's which have been connecting to exchange without issue until last week when some updates were applied to the exchange server.
Now their outlook will connect/disconnect from exchange every few seconds and when trying to send an email they are deposited directly into the drafts folder.
The issue occurs both while in the office and connected to the domain, and also when trying to send mail from an outside connection using http proxy connection for exchange.

Server is running Windows Server Standard SP2
Exchange is version 8.03.0342.000 with Rollup 12 installed

The updates applied to exchange just before the issues arose are: (aside from definition updates)
KB2893984
KB890830

Is it likely for any of these to affect the connectivity for macs?  Does anyone else have another suggestion?

Thanks.