Duplicate Appointments in Outlook 2013

Recently I was working on a project where service appointment and recurring appointment in client's outlook 2013 client kept duplicating itself when the appointment is tracked / created in CRM. This is what resolved the issue for us:
 

Resolution:  

1: The presence of the HKEY_CLASSES_ROOT\TypeLib\{2DF8D04C-5BFA-101B-BDE5-00AA0044DE52} registry key.

 

Followed these steps:

1.       Exit Outlook.

2.       Click Start, click Run, type regedit, and then click OK.

3.       Locate the following registry subkey:

HKEY_CLASSES_ROOT\TypeLib\{2DF8D04C-5BFA-101B-BDE5-00AA0044DE52}

4.       Right-click on the registry key, and then select Export. Save the export to your desktop to create a backup.

5.       Right-click on the key again, and then select delete.

6.       Start Outlook.

 

2: Previous version of Office had left behind reference to an older OLB file.
 

Followed these steps:

1.       Exit Outlook.

 

2.       Click Start, click Run, type regedit, and then click OK.

 

3.       Locate the following registry subkey:

 

                                 4.       HKEY_CLASSES_ROOT\TypeLib\{00062FFF-0000-0000-C000-000000000046}

 

                              5.       Delete the version keys (e.g. 9.4  and 9.3) for any version of Outlook that is not installed on your system based on the version table provided below. For example, if you are not using Outlook 2013 then remove the "9.5" entry. If you are not using Outlook 2010 then remove the "9.4" entry. If you are not using Outlook 2007 then remove the "9.3" entry.

Outlook	Version
Outlook 2003	9.2
Outlook 2007	9.3
Outlook 2010	9.4
Outlook 2013	9.5

 
3:  Removed third party add-ins

o   Business Connectivity Services Add-ins

o   GigaTrust Desktop Client Outlook Add-ins

o   McAfee E-mail Scan Add-ins

4: Upgrade CRM client for outlook from Service Pack 1 to Service Pack 1-UR1 for CRM 2013

o   http://www.microsoft.com/en-us/download/details.aspx?id=44262

 

 

Note: Please backup the registry before making any changes. Also please make registry changes at your own risk.