Simply open the following URL:
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Check the log textbox if the following statement is present (might be accomodated by a 401 exception).
Receiving a service unavailable response on a website usually indicates, that the application pool of the site is not running.
To solve this issue, open your InternetInformation Management and verify all required app pools are started.
Before you can upgrade your CRM 4 to 2011, you will need to uninstall all 3rd party addons and check that all buttons have been deleted. After the migration you can then install the latest version of each addon. Should you have not done this, then it will be more complicated to get rid of the buttons and icons before you can install the CRM 2011 addons.
On a migrated organization, make sure the dcp/gc/ti security role migrated from CRM 4 is deleted.
This migrated role might interfere with the new setup and block the user from installing, because rights are checked wrongly.
Please note: This article applies to Group Calendar in MS Dynamics CRM 2011, 2013, 2015 and 2015/2016+++++++++++++++++++++++++++++++++++++++
This article contains a detailed guide on how to find out the version number for each mscrm-addons product in CRM 4.0.
Outlook 2010 is having some severe problems with Ajax based functions. Being a reported error with Microsoft, there is still no fix available, but a workaroud.
Basics:License-checks are done each time the application is accessed by a user.
Having an invalid license stops the whole product from working.
An invalid license will never have any impact on Dynamics 365, it only limits the addon itself.