Can not share Tasks or Calendars in Outlook 2010

Good Morning Experts,
We are having an issue with our Exchange 2010 Server and Outlook 2010 clients. We cannot share tasks or calendars through outlook 2010. We continue to receive this Error when creating the share request: “Error while preparing to send sharing message.”
A few weird quirks:
•      Tasks and calendars share just fine thru Outlook 2007 to an Outlook 2010 User. Issues only happen when going from Outlook 2010 to Outlook 2010 or from Outlook 2010 to Outlook 2007.
•      When an Outlook 2010 client inside the network creates the sharing request the error is received.
•      An Outlook 2010 client can create the share request at an offsite location thru VPN and not receive the error, but the Outlook 2010 recipient cannot accept it, the error is generated once “Accept” is clicked on the recipient side.

Has anyone else seen or had experience with this issue?
Thank you!
ISHELPIT ManagerAsked:
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Madan SharmaConsultantCommented:
Please post the exact error what you are getting. if possible please post the error screenshot. that will be helpful to find out the solution for you.
ISHELPIT ManagerAuthor Commented:
Attached is the steps taken in Outlook 2010 and the error generated.

Thank you.
 Task and Calendar Sharing Error
Madan SharmaConsultantCommented:
In outlook 2010 you must have to set the permissions first before sharing the task with other users. So to set permissions just click on Folder Permissions then add the required users with required permissions then try to send sharing invitation. This could be a bug in outlook 2010 and may be we get fix for it in coming sp.
All try to update your  office to SP1
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ISHELPIT ManagerAuthor Commented:
Hi akicute555,

Thank you for the reply! I tested what you suggested and still received the same error. Here are some screen shots of the steps and the error. I will keep this up to date with what I find.

Folder Permissions Sharing Attempt Final Error
Thank you for your assistance.
Madan SharmaConsultantCommented:
How about your availability  Service Configuration. is that configured properly or not. Please check that I believe the service will not be configured correctly you will receive this error. So please make sure the your Web service Directory is configured properly.
ISHELPIT ManagerAuthor Commented:
So after some head banging, I read an article concerning IIS SSL and Header Redirections for OWA. After going thru the instructions listed in the article we are now able to share calendars with in our exchange organization. This all stemmed from an improperly setup OWA on our new exchange server.

Here is the article that I used to solve this issue:
Redirecting OWA URL's in Exchange 2010

Good Luck out there and thanks Experts for your assistance.

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ISHELPIT ManagerAuthor Commented:
I found this answer myself after an avid web search.
ISHELPIT ManagerAuthor Commented:
Issue resolved by this Article found on the web.
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