OWA emails sent in firefox not readable in outlook

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Martin Leggott


We have a strange issue whereby if a user sends an email to another user within the organisation on the same server from both Internet Explorer and Firefox, only the Internet Explorer one can be read from within outlook.

The other email if you try to open within Outlook it says that one or more parameters are invalid. However, if the receiver opens their email from Outlook Web access it works and the email could be read.

Seems to be some incompatibilty when emails are sent from firefox and unable to be received. Has anyone else tried this or experienced it, and is there a cure?!


Evan Liu

Hi Martin,

First I recommend you to use Internet Explorer(IE). From the article below, we know that Firefox is not a good choice for OWA.

Using Outlook Web Access in Firefox


But if this issue only happened on individual users, you can follow these steps to troubleshoot the problem:

1. What the version of your Outlook, if your Outlook is early version, please use latest version of Outlook to have a try.

2. please install latest version of Firefox to have a try.

If the issue occur to all the Firefox users, then I recommend you to post the issue in forum for Firefox.

Firefox Support Forum


Best Regards,


Martin Leggott


After setting up an additional Exchange 2007 Server which all was working fine, I narrowed it down to being our Disclaimer Software that didnt work with the Light Version!

I contacted the company and they supplied us with a patch for Exchange 2007 SP3. For anyone with the same issue we Use QSDisclaimer, and is relevant to SP3 installations.

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