Could Zulu SMS conflict with Exchange server

Is it possible/plausible that the SMS functionalities in Zulu could have an effect on MS Exchange’s built-in SMS functionalities? For the longest time I’ve been using the Exchange SMS support to receive SMS from my phone into my Outlook inbox. From there I’ve always been able to reply within Outlook and Exchange has done it’s magic and sent the SMS back out through the phone.

The SMS still are coming in to my Inbox from the phone but I’ve noticed this past week that the two I’ve tried to reply to from within Outlook have both bounced back with errors. This just happens to be roughly the same time that I’ve installed the Zulu client on my PC.