Hosted Exchange Server 2013 ( PRC over HTTPS) with Terminal Server 2008 Standard and Outlook 2007 connection problem

Hello everybody,

i have a problem with the previous written components and the following facts:
-      Users = 13
-      Each user have its own mailbox.
-      The users work with public terminal server accounts (each user can access each account)
-      in each account is one outlook profile with all mailboxes
I have connected one public mailbox called praxis@ to the outlook profile. This mailbox have the full access to the other mailboxes. So the other mailboxes are now displayed in outlook.
Some Users can open the outlook and some others can’t with the following error:

Error 1
The users witch can connect to the exchange server can’t open all mailboxes with the following error:

Error 2
The connection is established over RPC over HTTPS because it is a Hosted Exchange Server in another datacenter.
My guess is that it is up to the many simultaneous connections, but that is pure speculation.
Would be great if you had any idea what it could be.
Greetings D.Malkmus
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Are u trying to configure in Online mode or cached mode??
byteboysAuthor Commented:
Yes I have tried but the checkbox is disabled in the outlook 2007. I have tried out outlook 2013 un my PC. The cached mode opens the mailbox with a lot of sync problems. When i disable the cached mode i get the same error lit on the terminal server.
Henrik JohanssonSystems engineerCommented:
Outlook cached mode can't be enabled due to it's  incompatible with terminal server mode.
I think you should skip the shared/public user logins and give them individual user accounts. Unsure if it solve the issue, but it will give you better security and audit possibility.

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byteboysAuthor Commented:
I know but the company dont want that. It would be the last solution.
Henrik JohanssonSystems engineerCommented:
Can you translate the error message? My old school german hasn't been used so much the last 20 years and isn't in the best state.
byteboysAuthor Commented: ;)
Error 1:
Microsoft Exchange is currently not available

The folder can not be extended. The set of folders can not be opened. Microsoft Exchange is unavailable. There are network problems, or the Exchange computer is down for maintenance.
Henrik JohanssonSystems engineerCommented:
The error message about not able to expand folders remind me of our users got similar error when trying to access Public Folders after we migrated from onprem Exchange to Exchange Online (Office 365). The solution was to re-create the Outlook profile for users with the issue.
byteboysAuthor Commented:
It isn't a migration. It is a new installation. I have created new profiles for each user.
byteboysAuthor Commented:
That was my solution to, but i'm looking for another solution. It seams that noone knows.
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