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Have you tried temporarily disableing GFI Mail essentials on your server , it could be your disclaimer is changing the message class from calendar to to a default email.<br />
Also does exchange deliver the mail or do you another SMTP relay for mail delivery.
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Have you tried temporarily disableing GFI Mail essentials on your server , it could be your disclaimer is changing the message class from calendar to to a default email.
Also does exchange deliver the mail or do you another SMTP relay for mail delivery.

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Exchange delivers email..I havnt tried disabling Mail Essentials, but will test that over the weekend
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Exchange delivers email..I havnt tried disabling Mail Essentials, but will test that over the weekend

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Now we are using exchange 2010 upgraded from Exchange 2003, people are using meeting invitations &amp;&nbsp;scheduling. These work well when sent internally, people can accept, decline or tentative as they should, but when the go outside the organisation the invitations are sent as a blank email (see screenshot attached).<br />
I have unchecked the calandar option &quot;send in Icalandar format&quot;, that doenst work<br />
I have cleared the outlook cache, that doesnt work<br />
Emails are sent in HTML format or RTF &amp;&nbsp;neither work <a href="https://filedb.experts-exchange.com/incoming/2011/03_w13/436352/screenshot.jpg" target="_blank" title="invitation sent to my hotmail account (43 KB)"><img alt="invitation sent to my hotmail account" class="file-block lazyload" style="max-width: 800px;" data-src="https://filedb.experts-exchange.com/incoming/2011/03_w13/800_436352/screenshot.jpg" /></a>
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screenshot.jpg

Now we are using exchange 2010 upgraded from Exchange 2003, people are using meeting invitations & scheduling. These work well when sent internally, people can accept, decline or tentative as they should, but when the go outside the organisation the invitations are sent as a blank email (see screenshot attached).
I have unchecked the calandar option "send in Icalandar format", that doenst work
I have cleared the outlook cache, that doesnt work
Emails are sent in HTML format or RTF & neither work 

Outlook Calandar Invitations not in correct format

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.

Outlook

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.